nasm.c

/* The Netwide Assembler main program module
 *
 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
 * Julian Hall. All rights reserved. The software is
 * redistributable under the licence given in the file "Licence"
 * distributed in the NASM archive.
 */

#include "compiler.h"

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <inttypes.h>
#include <limits.h>

#include "nasm.h"
#include "nasmlib.h"
#include "stdscan.h"
#include "insns.h"
#include "preproc.h"
#include "parser.h"
#include "eval.h"
#include "assemble.h"
#include "labels.h"
#include "outform.h"
#include "listing.h"

struct forwrefinfo {            /* info held on forward refs. */
    int lineno;
    int operand;
};

static int get_bits(char *value);
static uint32_t get_cpu(char *cpu_str);
static void parse_cmdline(int, char **);
static void assemble_file(char *);
static int getkw(char **directive, char **value);
static void register_output_formats(void);
static void report_error_gnu(int severity, const char *fmt, ...);
static void report_error_vc(int severity, const char *fmt, ...);
static void report_error_common(int severity, const char *fmt,
                                va_list args);
static int is_suppressed_warning(int severity);
static void usage(void);
static efunc report_error;

static int using_debug_info, opt_verbose_info;
int tasm_compatible_mode = FALSE;
int pass0;
int maxbits = 0;
int globalrel = 0;

static char inname[FILENAME_MAX];
static char outname[FILENAME_MAX];
static char listname[FILENAME_MAX];
static char errname[FILENAME_MAX];
static int globallineno;        /* for forward-reference tracking */
/* static int pass = 0; */
static struct ofmt *ofmt = NULL;

static FILE *error_file;        /* Where to write error messages */

static FILE *ofile = NULL;
int optimizing = -1;            /* number of optimization passes to take */
static int sb, cmd_sb = 16;     /* by default */
static uint32_t cmd_cpu = IF_PLEVEL;       /* highest level by default */
static uint32_t cpu = IF_PLEVEL;   /* passed to insn_size & assemble.c */
int global_offset_changed;      /* referenced in labels.c */

static struct location location;
int in_abs_seg;                 /* Flag we are in ABSOLUTE seg */
int32_t abs_seg;                   /* ABSOLUTE segment basis */
int32_t abs_offset;                /* ABSOLUTE offset */

static struct RAA *offsets;

static struct SAA *forwrefs;    /* keep track of forward references */
static const struct forwrefinfo *forwref;

static Preproc *preproc;
enum op_type {
    op_normal,                  /* Preprocess and assemble */
    op_preprocess,              /* Preprocess only */
    op_depend,                  /* Generate dependencies */
    op_depend_missing_ok,	/* Generate dependencies, missing OK */
};
static enum op_type operating_mode;

/*
 * Which of the suppressible warnings are suppressed. Entry zero
 * doesn't do anything. Initial defaults are given here.
 */
static char suppressed[1 + ERR_WARN_MAX] = {
    0, TRUE, TRUE, TRUE, FALSE, TRUE
};

/*
 * The option names for the suppressible warnings. As before, entry
 * zero does nothing.
 */
static const char *suppressed_names[1 + ERR_WARN_MAX] = {
    NULL, "macro-params", "macro-selfref", "orphan-labels",
        "number-overflow",
    "gnu-elf-extensions"
};

/*
 * The explanations for the suppressible warnings. As before, entry
 * zero does nothing.
 */
static const char *suppressed_what[1 + ERR_WARN_MAX] = {
    NULL,
    "macro calls with wrong no. of params",
    "cyclic macro self-references",
    "labels alone on lines without trailing `:'",
    "numeric constants greater than 0xFFFFFFFF",
    "using 8- or 16-bit relocation in ELF, a GNU extension"
};

/*
 * This is a null preprocessor which just copies lines from input
 * to output. It's used when someone explicitly requests that NASM
 * not preprocess their source file.
 */

static void no_pp_reset(char *, int, efunc, evalfunc, ListGen *);
static char *no_pp_getline(void);
static void no_pp_cleanup(int);
static Preproc no_pp = {
    no_pp_reset,
    no_pp_getline,
    no_pp_cleanup
};

/*
 * get/set current offset...
 */
#define GET_CURR_OFFS (in_abs_seg?abs_offset:\
		      raa_read(offsets,location.segment))
#define SET_CURR_OFFS(x) (in_abs_seg?(void)(abs_offset=(x)):\
			 (void)(offsets=raa_write(offsets,location.segment,(x))))

static int want_usage;
static int terminate_after_phase;
int user_nolist = 0;            /* fbk 9/2/00 */

static void nasm_fputs(const char *line, FILE * outfile)
{
    if (outfile) {
        fputs(line, outfile);
        fputc('\n', outfile);
    } else
        puts(line);
}

int main(int argc, char **argv)
{
    pass0 = 1;
    want_usage = terminate_after_phase = FALSE;
    report_error = report_error_gnu;

    error_file = stderr;

    nasm_set_malloc_error(report_error);
    offsets = raa_init();
    forwrefs = saa_init((int32_t)sizeof(struct forwrefinfo));

    preproc = &nasmpp;
    operating_mode = op_normal;

    seg_init();

    register_output_formats();

    parse_cmdline(argc, argv);

    if (terminate_after_phase) {
        if (want_usage)
            usage();
        return 1;
    }

    /* If debugging info is disabled, suppress any debug calls */
    if (!using_debug_info)
        ofmt->current_dfmt = &null_debug_form;

    if (ofmt->stdmac)
        pp_extra_stdmac(ofmt->stdmac);
    parser_global_info(ofmt, &location);
    eval_global_info(ofmt, lookup_label, &location);

    /* define some macros dependent of command-line */
    {
        char temp[64];
        snprintf(temp, sizeof(temp), "__OUTPUT_FORMAT__=%s\n",
                 ofmt->shortname);
        pp_pre_define(temp);
    }

    switch (operating_mode) {
    case op_depend_missing_ok:
	pp_include_path(NULL);	/* "assume generated" */
	/* fall through */
    case op_depend:
        {
            char *line;
            preproc->reset(inname, 0, report_error, evaluate, &nasmlist);
            if (outname[0] == '\0')
                ofmt->filename(inname, outname, report_error);
            ofile = NULL;
            fprintf(stdout, "%s: %s", outname, inname);
            while ((line = preproc->getline()))
                nasm_free(line);
            preproc->cleanup(0);
            putc('\n', stdout);
        }
        break;

    case op_preprocess:
        {
            char *line;
            char *file_name = NULL;
            int32_t prior_linnum = 0;
            int lineinc = 0;

            if (*outname) {
                ofile = fopen(outname, "w");
                if (!ofile)
                    report_error(ERR_FATAL | ERR_NOFILE,
                                 "unable to open output file `%s'",
                                 outname);
            } else
                ofile = NULL;

            location.known = FALSE;

/*      pass = 1; */
            preproc->reset(inname, 2, report_error, evaluate, &nasmlist);
            while ((line = preproc->getline())) {
                /*
                 * We generate %line directives if needed for later programs
                 */
                int32_t linnum = prior_linnum += lineinc;
                int altline = src_get(&linnum, &file_name);
                if (altline) {
                    if (altline == 1 && lineinc == 1)
                        nasm_fputs("", ofile);
                    else {
                        lineinc = (altline != -1 || lineinc != 1);
                        fprintf(ofile ? ofile : stdout,
                                "%%line %"PRId32"+%d %s\n", linnum, lineinc,
                                file_name);
                    }
                    prior_linnum = linnum;
                }
                nasm_fputs(line, ofile);
                nasm_free(line);
            }
            nasm_free(file_name);
            preproc->cleanup(0);
            if (ofile)
                fclose(ofile);
            if (ofile && terminate_after_phase)
                remove(outname);
        }
        break;

    case op_normal:
        {
            /*
             * We must call ofmt->filename _anyway_, even if the user
             * has specified their own output file, because some
             * formats (eg OBJ and COFF) use ofmt->filename to find out
             * the name of the input file and then put that inside the
             * file.
             */
            ofmt->filename(inname, outname, report_error);

            ofile = fopen(outname, "wb");
            if (!ofile) {
                report_error(ERR_FATAL | ERR_NOFILE,
                             "unable to open output file `%s'", outname);
            }

            /*
             * We must call init_labels() before ofmt->init() since
             * some object formats will want to define labels in their
             * init routines. (eg OS/2 defines the FLAT group)
             */
            init_labels();

            ofmt->init(ofile, report_error, define_label, evaluate);

            assemble_file(inname);

            if (!terminate_after_phase) {
                ofmt->cleanup(using_debug_info);
                cleanup_labels();
            } else {
                /*
                 * We had an fclose on the output file here, but we
                 * actually do that in all the object file drivers as well,
                 * so we're leaving out the one here.
                 *     fclose (ofile);
                 */
                remove(outname);
                if (listname[0])
                    remove(listname);
            }
        }
        break;
    }

    if (want_usage)
        usage();

    raa_free(offsets);
    saa_free(forwrefs);
    eval_cleanup();
    stdscan_cleanup();

    if (terminate_after_phase)
        return 1;
    else
        return 0;
}

/*
 * Get a parameter for a command line option.
 * First arg must be in the form of e.g. -f...
 */
static char *get_param(char *p, char *q, int *advance)
{
    *advance = 0;
    if (p[2]) {                 /* the parameter's in the option */
        p += 2;
        while (isspace(*p))
            p++;
        return p;
    }
    if (q && q[0]) {
        *advance = 1;
        return q;
    }
    report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                 "option `-%c' requires an argument", p[1]);
    return NULL;
}

struct textargs {
    const char *label;
    int value;
};

#define OPT_PREFIX 0
#define OPT_POSTFIX 1
struct textargs textopts[] = {
    {"prefix", OPT_PREFIX},
    {"postfix", OPT_POSTFIX},
    {NULL, 0}
};

int stopoptions = 0;
static int process_arg(char *p, char *q)
{
    char *param;
    int i, advance = 0;

    if (!p || !p[0])
        return 0;

    if (p[0] == '-' && !stopoptions) {
        switch (p[1]) {
        case 's':
            error_file = stdout;
            break;
        case 'o':              /* these parameters take values */
        case 'O':
        case 'f':
        case 'p':
        case 'P':
        case 'd':
        case 'D':
        case 'i':
        case 'I':
        case 'l':
        case 'F':
        case 'X':
        case 'u':
        case 'U':
	case 'Z':
            if (!(param = get_param(p, q, &advance)))
                break;
            if (p[1] == 'o') {  /* output file */
                strcpy(outname, param);
            } else if (p[1] == 'f') {   /* output format */
                ofmt = ofmt_find(param);
                if (!ofmt) {
                    report_error(ERR_FATAL | ERR_NOFILE | ERR_USAGE,
                                 "unrecognised output format `%s' - "
                                 "use -hf for a list", param);
                } else
                    ofmt->current_dfmt = ofmt->debug_formats[0];
            } else if (p[1] == 'O') {   /* Optimization level */
                int opt;
		
		if (!*param) {
		    /* Naked -O == -Ox */
		    optimizing = INT_MAX >> 1; /* Almost unlimited */
		} else {
		    while (*param) {
			switch (*param) {
			case '0': case '1': case '2': case '3': case '4':
			case '5': case '6': case '7': case '8': case '9':
			    opt = strtoul(param, &param, 10);

			    /* -O0 -> optimizing == -1, 0.98 behaviour */
			    /* -O1 -> optimizing == 0, 0.98.09 behaviour */
			    if (opt < 2)
				optimizing = opt - 1;
			    else if (opt <= 5)
				/* The optimizer seems to have problems with
				   < 5 passes?  Hidden bug? */
				optimizing = 5;	/* 5 passes */
			    else
				optimizing = opt;   /* More than 5 passes */
			    break;
			    
			case 'v':
			case '+':
			    param++;
			    opt_verbose_info = TRUE;
			    break;
			    
			case 'x':
			    param++;
			    optimizing = INT_MAX >> 1; /* Almost unlimited */
			    break;
			    
			default:
			    report_error(ERR_FATAL,
					 "unknown optimization option -O%c\n",
					 *param);
			    break;
			}
		    }
		}
            } else if (p[1] == 'P' || p[1] == 'p') {    /* pre-include */
                pp_pre_include(param);
            } else if (p[1] == 'D' || p[1] == 'd') {    /* pre-define */
                pp_pre_define(param);
            } else if (p[1] == 'U' || p[1] == 'u') {    /* un-define */
                pp_pre_undefine(param);
            } else if (p[1] == 'I' || p[1] == 'i') {    /* include search path */
                pp_include_path(param);
            } else if (p[1] == 'l') {   /* listing file */
                strcpy(listname, param);
            } else if (p[1] == 'Z') {   /* error messages file */
                strcpy(errname, param);
            } else if (p[1] == 'F') {   /* specify debug format */
                ofmt->current_dfmt = dfmt_find(ofmt, param);
                if (!ofmt->current_dfmt) {
                    report_error(ERR_FATAL | ERR_NOFILE | ERR_USAGE,
                                 "unrecognized debug format `%s' for"
                                 " output format `%s'",
                                 param, ofmt->shortname);
                }
            } else if (p[1] == 'X') {   /* specify error reporting format */
                if (nasm_stricmp("vc", param) == 0)
                    report_error = report_error_vc;
                else if (nasm_stricmp("gnu", param) == 0)
                    report_error = report_error_gnu;
                else
                    report_error(ERR_FATAL | ERR_NOFILE | ERR_USAGE,
                                 "unrecognized error reporting format `%s'",
                                 param);
            }
            break;
        case 'g':
            using_debug_info = TRUE;
            break;
        case 'h':
            printf
                ("usage: nasm [-@ response file] [-o outfile] [-f format] "
                 "[-l listfile]\n"
                 "            [options...] [--] filename\n"
                 "    or nasm -v   for version info\n\n"
                 "    -t          assemble in SciTech TASM compatible mode\n"
                 "    -g          generate debug information in selected format.\n");
            printf
                ("    -E (or -e)  preprocess only (writes output to stdout by default)\n"
                 "    -a          don't preprocess (assemble only)\n"
                 "    -M          generate Makefile dependencies on stdout\n"
                 "    -MG         d:o, missing files assumed generated\n\n"
                 "    -Z<file>    redirect error messages to file\n"
                 "    -s          redirect error messages to stdout\n\n"
                 "    -F format   select a debugging format\n\n"
                 "    -I<path>    adds a pathname to the include file path\n");
            printf
                ("    -O<digit>   optimize branch offsets (-O0 disables, default)\n"
                 "    -P<file>    pre-includes a file\n"
                 "    -D<macro>[=<value>] pre-defines a macro\n"
                 "    -U<macro>   undefines a macro\n"
                 "    -X<format>  specifies error reporting format (gnu or vc)\n"
                 "    -w+foo      enables warnings about foo; -w-foo disables them\n"
                 "where foo can be:\n");
            for (i = 1; i <= ERR_WARN_MAX; i++)
                printf("    %-23s %s (default %s)\n",
                       suppressed_names[i], suppressed_what[i],
                       suppressed[i] ? "off" : "on");
            printf
                ("\nresponse files should contain command line parameters"
                 ", one per line.\n");
            if (p[2] == 'f') {
                printf("\nvalid output formats for -f are"
                       " (`*' denotes default):\n");
                ofmt_list(ofmt, stdout);
            } else {
                printf("\nFor a list of valid output formats, use -hf.\n");
                printf("For a list of debug formats, use -f <form> -y.\n");
            }
            exit(0);            /* never need usage message here */
            break;
        case 'y':
            printf("\nvalid debug formats for '%s' output format are"
                   " ('*' denotes default):\n", ofmt->shortname);
            dfmt_list(ofmt, stdout);
            exit(0);
            break;
        case 't':
            tasm_compatible_mode = TRUE;
            break;
        case 'v':
            {
                const char *nasm_version_string =
                    "NASM version " NASM_VER " compiled on " __DATE__
#ifdef DEBUG
                    " with -DDEBUG"
#endif
                    ;
                puts(nasm_version_string);
                exit(0);        /* never need usage message here */
            }
            break;
        case 'e':              /* preprocess only */
	case 'E':
            operating_mode = op_preprocess;
            break;
        case 'a':              /* assemble only - don't preprocess */
            preproc = &no_pp;
            break;
        case 'w':
            if (p[2] != '+' && p[2] != '-') {
                report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                             "invalid option to `-w'");
            } else {
                for (i = 1; i <= ERR_WARN_MAX; i++)
                    if (!nasm_stricmp(p + 3, suppressed_names[i]))
                        break;
                if (i <= ERR_WARN_MAX)
                    suppressed[i] = (p[2] == '-');
                else
                    report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                                 "invalid option to `-w'");
            }
            break;
        case 'M':
            operating_mode = p[2] == 'G' ? op_depend_missing_ok : op_depend;
            break;

        case '-':
            {
                int s;

                if (p[2] == 0) {        /* -- => stop processing options */
                    stopoptions = 1;
                    break;
                }
                for (s = 0; textopts[s].label; s++) {
                    if (!nasm_stricmp(p + 2, textopts[s].label)) {
                        break;
                    }
                }

                switch (s) {

                case OPT_PREFIX:
                case OPT_POSTFIX:
                    {
                        if (!q) {
                            report_error(ERR_NONFATAL | ERR_NOFILE |
                                         ERR_USAGE,
                                         "option `--%s' requires an argument",
                                         p + 2);
                            break;
                        } else {
                            advance = 1, param = q;
                        }

                        if (s == OPT_PREFIX) {
                            strncpy(lprefix, param, PREFIX_MAX - 1);
                            lprefix[PREFIX_MAX - 1] = 0;
                            break;
                        }
                        if (s == OPT_POSTFIX) {
                            strncpy(lpostfix, param, POSTFIX_MAX - 1);
                            lpostfix[POSTFIX_MAX - 1] = 0;
                            break;
                        }
                        break;
                    }
                default:
                    {
                        report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                                     "unrecognised option `--%s'", p + 2);
                        break;
                    }
                }
                break;
            }

        default:
            if (!ofmt->setinfo(GI_SWITCH, &p))
                report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                             "unrecognised option `-%c'", p[1]);
            break;
        }
    } else {
        if (*inname) {
            report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                         "more than one input file specified");
        } else
            strcpy(inname, p);
    }

    return advance;
}

#define ARG_BUF_DELTA 128

static void process_respfile(FILE * rfile)
{
    char *buffer, *p, *q, *prevarg;
    int bufsize, prevargsize;

    bufsize = prevargsize = ARG_BUF_DELTA;
    buffer = nasm_malloc(ARG_BUF_DELTA);
    prevarg = nasm_malloc(ARG_BUF_DELTA);
    prevarg[0] = '\0';

    while (1) {                 /* Loop to handle all lines in file */

        p = buffer;
        while (1) {             /* Loop to handle long lines */
            q = fgets(p, bufsize - (p - buffer), rfile);
            if (!q)
                break;
            p += strlen(p);
            if (p > buffer && p[-1] == '\n')
                break;
            if (p - buffer > bufsize - 10) {
                int offset;
                offset = p - buffer;
                bufsize += ARG_BUF_DELTA;
                buffer = nasm_realloc(buffer, bufsize);
                p = buffer + offset;
            }
        }

        if (!q && p == buffer) {
            if (prevarg[0])
                process_arg(prevarg, NULL);
            nasm_free(buffer);
            nasm_free(prevarg);
            return;
        }

        /*
         * Play safe: remove CRs, LFs and any spurious ^Zs, if any of
         * them are present at the end of the line.
         */
        *(p = &buffer[strcspn(buffer, "\r\n\032")]) = '\0';

        while (p > buffer && isspace(p[-1]))
            *--p = '\0';

        p = buffer;
        while (isspace(*p))
            p++;

        if (process_arg(prevarg, p))
            *p = '\0';

        if (strlen(p) > prevargsize - 10) {
            prevargsize += ARG_BUF_DELTA;
            prevarg = nasm_realloc(prevarg, prevargsize);
        }
        strcpy(prevarg, p);
    }
}

/* Function to process args from a string of args, rather than the
 * argv array. Used by the environment variable and response file
 * processing.
 */
static void process_args(char *args)
{
    char *p, *q, *arg, *prevarg;
    char separator = ' ';

    p = args;
    if (*p && *p != '-')
        separator = *p++;
    arg = NULL;
    while (*p) {
        q = p;
        while (*p && *p != separator)
            p++;
        while (*p == separator)
            *p++ = '\0';
        prevarg = arg;
        arg = q;
        if (process_arg(prevarg, arg))
            arg = NULL;
    }
    if (arg)
        process_arg(arg, NULL);
}

static void parse_cmdline(int argc, char **argv)
{
    FILE *rfile;
    char *envreal, *envcopy = NULL, *p, *arg;

    *inname = *outname = *listname = *errname = '\0';

    /*
     * First, process the NASMENV environment variable.
     */
    envreal = getenv("NASMENV");
    arg = NULL;
    if (envreal) {
        envcopy = nasm_strdup(envreal);
        process_args(envcopy);
        nasm_free(envcopy);
    }

    /*
     * Now process the actual command line.
     */
    while (--argc) {
        int i;
        argv++;
        if (argv[0][0] == '@') {
            /* We have a response file, so process this as a set of
             * arguments like the environment variable. This allows us
             * to have multiple arguments on a single line, which is
             * different to the -@resp file processing below for regular
             * NASM.
             */
            char *str = malloc(2048);
            FILE *f = fopen(&argv[0][1], "r");
            if (!str) {
                printf("out of memory");
                exit(-1);
            }
            if (f) {
                while (fgets(str, 2048, f)) {
                    process_args(str);
                }
                fclose(f);
            }
            free(str);
            argc--;
            argv++;
        }
        if (!stopoptions && argv[0][0] == '-' && argv[0][1] == '@') {
	    p = get_param(argv[0], argc > 1 ? argv[1] : NULL, &i);
            if (p) {
		rfile = fopen(p, "r");
                if (rfile) {
                    process_respfile(rfile);
                    fclose(rfile);
                } else
                    report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                                 "unable to open response file `%s'", p);
            }
        } else
            i = process_arg(argv[0], argc > 1 ? argv[1] : NULL);
        argv += i, argc -= i;
    }

    if (!*inname)
        report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                     "no input file specified");

    /* Look for basic command line typos.  This definitely doesn't
       catch all errors, but it might help cases of fumbled fingers. */
    if (!strcmp(inname, errname) || !strcmp(inname, outname) ||
	!strcmp(inname, listname))
	report_error(ERR_FATAL | ERR_NOFILE | ERR_USAGE,
		     "file `%s' is both input and output file",
		     inname);

    if (*errname) {  
	error_file = fopen(errname, "w");
	if (!error_file) {
	    error_file = stderr;        /* Revert to default! */
	    report_error(ERR_FATAL | ERR_NOFILE | ERR_USAGE,
			 "cannot open file `%s' for error messages",
			 errname);
	}
    }
}

/* List of directives */
enum {
    D_NONE, D_ABSOLUTE, D_BITS, D_COMMON, D_CPU, D_DEBUG, D_DEFAULT,
    D_EXTERN, D_GLOBAL, D_LIST, D_SECTION, D_SEGMENT, D_WARNING
};
static const char *directives[] = {
    "", "absolute", "bits", "common", "cpu", "debug", "default",
    "extern", "global", "list", "section", "segment", "warning"
};

static void assemble_file(char *fname)
{
    char *directive, *value, *p, *q, *special, *line, debugid[80];
    insn output_ins;
    int i, rn_error, validid;
    int32_t seg, offs;
    struct tokenval tokval;
    expr *e;
    int pass, pass_max;
    int pass_cnt = 0;           /* count actual passes */

    if (cmd_sb == 32 && cmd_cpu < IF_386)
        report_error(ERR_FATAL, "command line: "
                     "32-bit segment size requires a higher cpu");

    pass_max = (optimizing > 0 ? optimizing : 0) + 2;   /* passes 1, optimizing, then 2 */
    pass0 = !(optimizing > 0);  /* start at 1 if not optimizing */
    for (pass = 1; pass <= pass_max && pass0 <= 2; pass++) {
        int pass1, pass2;
        ldfunc def_label;

        pass1 = pass < pass_max ? 1 : 2;        /* seq is 1, 1, 1,..., 1, 2 */
        pass2 = pass > 1 ? 2 : 1;       /* seq is 1, 2, 2,..., 2, 2 */
        /*      pass0                            seq is 0, 0, 0,..., 1, 2 */

        def_label = pass > 1 ? redefine_label : define_label;

        globalbits = sb = cmd_sb;   /* set 'bits' to command line default */
        cpu = cmd_cpu;
        if (pass0 == 2) {
            if (*listname)
                nasmlist.init(listname, report_error);
        }
        in_abs_seg = FALSE;
        global_offset_changed = FALSE;  /* set by redefine_label */
        location.segment = ofmt->section(NULL, pass2, &sb);
        globalbits = sb;
        if (pass > 1) {
            saa_rewind(forwrefs);
            forwref = saa_rstruct(forwrefs);
            raa_free(offsets);
            offsets = raa_init();
        }
        preproc->reset(fname, pass1, report_error, evaluate, &nasmlist);
        globallineno = 0;
        if (pass == 1)
            location.known = TRUE;
        location.offset = offs = GET_CURR_OFFS;

        while ((line = preproc->getline())) {
            globallineno++;

            /* here we parse our directives; this is not handled by the 'real'
             * parser. */
            directive = line;
	    i = getkw(&directive, &value);
            if (i) {
		int err = 0;

                switch (i) {
                case D_SEGMENT:		/* [SEGMENT n] */
		case D_SECTION:
                    seg = ofmt->section(value, pass2, &sb);
                    if (seg == NO_SEG) {
                        report_error(pass1 == 1 ? ERR_NONFATAL : ERR_PANIC,
                                     "segment name `%s' not recognized",
                                     value);
                    } else {
                        in_abs_seg = FALSE;
                        location.segment = seg;
                    }
                    break;
                case D_EXTERN:		/* [EXTERN label:special] */
                    if (*value == '$')
                        value++;        /* skip initial $ if present */
                    if (pass0 == 2) {
                        q = value;
                        while (*q && *q != ':')
                            q++;
                        if (*q == ':') {
                            *q++ = '\0';
                            ofmt->symdef(value, 0L, 0L, 3, q);
                        }
                    } else if (pass == 1) {     /* pass == 1 */
                        q = value;
                        validid = TRUE;
                        if (!isidstart(*q))
                            validid = FALSE;
                        while (*q && *q != ':') {
                            if (!isidchar(*q))
                                validid = FALSE;
                            q++;
                        }
                        if (!validid) {
                            report_error(ERR_NONFATAL,
                                         "identifier expected after EXTERN");
                            break;
                        }
                        if (*q == ':') {
                            *q++ = '\0';
                            special = q;
                        } else
                            special = NULL;
                        if (!is_extern(value)) {        /* allow re-EXTERN to be ignored */
                            int temp = pass0;
                            pass0 = 1;  /* fake pass 1 in labels.c */
                            declare_as_global(value, special,
                                              report_error);
                            define_label(value, seg_alloc(), 0L, NULL,
                                         FALSE, TRUE, ofmt, report_error);
                            pass0 = temp;
                        }
                    }           /* else  pass0 == 1 */
                    break;
                case D_BITS:		/* [BITS bits] */
                    globalbits = sb = get_bits(value);
                    break;
                case D_GLOBAL:		/* [GLOBAL symbol:special] */
                    if (*value == '$')
                        value++;        /* skip initial $ if present */
                    if (pass0 == 2) {   /* pass 2 */
                        q = value;
                        while (*q && *q != ':')
                            q++;
                        if (*q == ':') {
                            *q++ = '\0';
                            ofmt->symdef(value, 0L, 0L, 3, q);
                        }
                    } else if (pass2 == 1) {    /* pass == 1 */
                        q = value;
                        validid = TRUE;
                        if (!isidstart(*q))
                            validid = FALSE;
                        while (*q && *q != ':') {
                            if (!isidchar(*q))
                                validid = FALSE;
                            q++;
                        }
                        if (!validid) {
                            report_error(ERR_NONFATAL,
                                         "identifier expected after GLOBAL");
                            break;
                        }
                        if (*q == ':') {
                            *q++ = '\0';
                            special = q;
                        } else
                            special = NULL;
                        declare_as_global(value, special, report_error);
                    }           /* pass == 1 */
                    break;
                case D_COMMON:		/* [COMMON symbol size:special] */
                    if (*value == '$')
                        value++;        /* skip initial $ if present */
                    if (pass0 == 1) {
                        p = value;
                        validid = TRUE;
                        if (!isidstart(*p))
                            validid = FALSE;
                        while (*p && !isspace(*p)) {
                            if (!isidchar(*p))
                                validid = FALSE;
                            p++;
                        }
                        if (!validid) {
                            report_error(ERR_NONFATAL,
                                         "identifier expected after COMMON");
                            break;
                        }
                        if (*p) {
                            int64_t size;

                            while (*p && isspace(*p))
                                *p++ = '\0';
                            q = p;
                            while (*q && *q != ':')
                                q++;
                            if (*q == ':') {
                                *q++ = '\0';
                                special = q;
                            } else
                                special = NULL;
                            size = readnum(p, &rn_error);
                            if (rn_error)
                                report_error(ERR_NONFATAL,
                                             "invalid size specified"
                                             " in COMMON declaration");
                            else
                                define_common(value, seg_alloc(), size,
                                              special, ofmt, report_error);
                        } else
                            report_error(ERR_NONFATAL,
                                         "no size specified in"
                                         " COMMON declaration");
                    } else if (pass0 == 2) {    /* pass == 2 */
                        q = value;
                        while (*q && *q != ':') {
                            if (isspace(*q))
                                *q = '\0';
                            q++;
                        }
                        if (*q == ':') {
                            *q++ = '\0';
                            ofmt->symdef(value, 0L, 0L, 3, q);
                        }
                    }
                    break;
                case D_ABSOLUTE:		/* [ABSOLUTE address] */
                    stdscan_reset();
                    stdscan_bufptr = value;
                    tokval.t_type = TOKEN_INVALID;
                    e = evaluate(stdscan, NULL, &tokval, NULL, pass2,
                                 report_error, NULL);
                    if (e) {
                        if (!is_reloc(e))
                            report_error(pass0 ==
                                         1 ? ERR_NONFATAL : ERR_PANIC,
                                         "cannot use non-relocatable expression as "
                                         "ABSOLUTE address");
                        else {
                            abs_seg = reloc_seg(e);
                            abs_offset = reloc_value(e);
                        }
                    } else if (pass == 1)
                        abs_offset = 0x100;     /* don't go near zero in case of / */
                    else
                        report_error(ERR_PANIC, "invalid ABSOLUTE address "
                                     "in pass two");
                    in_abs_seg = TRUE;
                    location.segment = NO_SEG;
                    break;
                case D_DEBUG:		/* [DEBUG] */
                    p = value;
                    q = debugid;
                    validid = TRUE;
                    if (!isidstart(*p))
                        validid = FALSE;
                    while (*p && !isspace(*p)) {
                        if (!isidchar(*p))
                            validid = FALSE;
                        *q++ = *p++;
                    }
                    *q++ = 0;
                    if (!validid) {
                        report_error(pass == 1 ? ERR_NONFATAL : ERR_PANIC,
                                     "identifier expected after DEBUG");
                        break;
                    }
                    while (*p && isspace(*p))
                        p++;
                    if (pass == pass_max)
                        ofmt->current_dfmt->debug_directive(debugid, p);
                    break;
                case D_WARNING:		/* [WARNING {+|-}warn-name] */
                    if (pass1 == 1) {
                        while (*value && isspace(*value))
                            value++;

                        if (*value == '+' || *value == '-') {
                            validid = (*value == '-') ? TRUE : FALSE;
                            value++;
                        } else
                            validid = FALSE;

                        for (i = 1; i <= ERR_WARN_MAX; i++)
                            if (!nasm_stricmp(value, suppressed_names[i]))
                                break;
                        if (i <= ERR_WARN_MAX)
                            suppressed[i] = validid;
                        else
                            report_error(ERR_NONFATAL,
                                         "invalid warning id in WARNING directive");
                    }
                    break;
                case D_CPU:		/* [CPU] */
                    cpu = get_cpu(value);
                    break;
                case D_LIST:		/* [LIST {+|-}] */
                    while (*value && isspace(*value))
                        value++;

                    if (*value == '+') {
                        user_nolist = 0;
                    } else {
                        if (*value == '-') {
                            user_nolist = 1;
                        } else {
			    err = 1;
                        }
                    }
                    break;
		case D_DEFAULT:		/* [DEFAULT] */
		    stdscan_reset();
                    stdscan_bufptr = value;
                    tokval.t_type = TOKEN_INVALID;
		    if (stdscan(NULL, &tokval) == TOKEN_SPECIAL) {
			switch ((int)tokval.t_integer) {
			case S_REL:
			    globalrel = 1;
			    break;
			case S_ABS:
			    globalrel = 0;
			    break;
			default:
			    err = 1;
			    break;
			}
		    } else {
			err = 1;
		    }
		    break;
                default:
                    if (!ofmt->directive(directive, value, pass2))
                        report_error(pass1 == 1 ? ERR_NONFATAL : ERR_PANIC,
                                     "unrecognised directive [%s]",
                                     directive);
                }
		if (err) {
		    report_error(ERR_NONFATAL,
				 "invalid parameter to [%s] directive",
				 directive);
		}
            } else {            /* it isn't a directive */

                parse_line(pass1, line, &output_ins,
                           report_error, evaluate, def_label);

                if (!(optimizing > 0) && pass == 2) {
                    if (forwref != NULL && globallineno == forwref->lineno) {
                        output_ins.forw_ref = TRUE;
                        do {
                            output_ins.oprs[forwref->operand].opflags |=
                                OPFLAG_FORWARD;
                            forwref = saa_rstruct(forwrefs);
                        } while (forwref != NULL
                                 && forwref->lineno == globallineno);
                    } else
                        output_ins.forw_ref = FALSE;
                }

                if (!(optimizing > 0) && output_ins.forw_ref) {
                    if (pass == 1) {
                        for (i = 0; i < output_ins.operands; i++) {
                            if (output_ins.oprs[i].
                                opflags & OPFLAG_FORWARD) {
                                struct forwrefinfo *fwinf =
                                    (struct forwrefinfo *)
                                    saa_wstruct(forwrefs);
                                fwinf->lineno = globallineno;
                                fwinf->operand = i;
                            }
                        }
                    } else {    /* pass == 2 */
                        /*
                         * Hack to prevent phase error in the code
                         *   rol ax,x
                         *   x equ 1
                         *
                         * If the second operand is a forward reference,
                         * the UNITY property of the number 1 in that
                         * operand is cancelled. Otherwise the above
                         * sequence will cause a phase error.
                         *
                         * This hack means that the above code will
                         * generate 286+ code.
                         *
                         * The forward reference will mean that the
                         * operand will not have the UNITY property on
                         * the first pass, so the pass behaviours will
                         * be consistent.
                         */

                        if (output_ins.operands >= 2 &&
                            (output_ins.oprs[1].opflags & OPFLAG_FORWARD) &&
			    !(IMMEDIATE & ~output_ins.oprs[1].type))
			{
			    /* Remove special properties bits */
			    output_ins.oprs[1].type &= ~REG_SMASK;
                        }

                    }           /* pass == 2 */

                }

                /*  forw_ref */
                if (output_ins.opcode == I_EQU) {
                    if (pass1 == 1) {
                        /*
                         * Special `..' EQUs get processed in pass two,
                         * except `..@' macro-processor EQUs which are done
                         * in the normal place.
                         */
                        if (!output_ins.label)
                            report_error(ERR_NONFATAL,
                                         "EQU not preceded by label");

                        else if (output_ins.label[0] != '.' ||
                                 output_ins.label[1] != '.' ||
                                 output_ins.label[2] == '@') {
                            if (output_ins.operands == 1 &&
                                (output_ins.oprs[0].type & IMMEDIATE) &&
                                output_ins.oprs[0].wrt == NO_SEG) {
                                int isext =
                                    output_ins.oprs[0].
                                    opflags & OPFLAG_EXTERN;
                                def_label(output_ins.label,
                                          output_ins.oprs[0].segment,
                                          output_ins.oprs[0].offset, NULL,
                                          FALSE, isext, ofmt,
                                          report_error);
                            } else if (output_ins.operands == 2
                                       && (output_ins.oprs[0].
                                           type & IMMEDIATE)
                                       && (output_ins.oprs[0].type & COLON)
                                       && output_ins.oprs[0].segment ==
                                       NO_SEG
                                       && output_ins.oprs[0].wrt == NO_SEG
                                       && (output_ins.oprs[1].
                                           type & IMMEDIATE)
                                       && output_ins.oprs[1].segment ==
                                       NO_SEG
                                       && output_ins.oprs[1].wrt ==
                                       NO_SEG) {
                                def_label(output_ins.label,
                                          output_ins.oprs[0].
                                          offset | SEG_ABS,
                                          output_ins.oprs[1].offset, NULL,
                                          FALSE, FALSE, ofmt,
                                          report_error);
                            } else
                                report_error(ERR_NONFATAL,
                                             "bad syntax for EQU");
                        }
                    } else {    /* pass == 2 */
                        /*
                         * Special `..' EQUs get processed here, except
                         * `..@' macro processor EQUs which are done above.
                         */
                        if (output_ins.label[0] == '.' &&
                            output_ins.label[1] == '.' &&
                            output_ins.label[2] != '@') {
                            if (output_ins.operands == 1 &&
                                (output_ins.oprs[0].type & IMMEDIATE)) {
                                define_label(output_ins.label,
                                             output_ins.oprs[0].segment,
                                             output_ins.oprs[0].offset,
                                             NULL, FALSE, FALSE, ofmt,
                                             report_error);
                            } else if (output_ins.operands == 2
                                       && (output_ins.oprs[0].
                                           type & IMMEDIATE)
                                       && (output_ins.oprs[0].type & COLON)
                                       && output_ins.oprs[0].segment ==
                                       NO_SEG
                                       && (output_ins.oprs[1].
                                           type & IMMEDIATE)
                                       && output_ins.oprs[1].segment ==
                                       NO_SEG) {
                                define_label(output_ins.label,
                                             output_ins.oprs[0].
                                             offset | SEG_ABS,
                                             output_ins.oprs[1].offset,
                                             NULL, FALSE, FALSE, ofmt,
                                             report_error);
                            } else
                                report_error(ERR_NONFATAL,
                                             "bad syntax for EQU");
                        }
                    }           /* pass == 2 */
                } else {        /* instruction isn't an EQU */

                    if (pass1 == 1) {

                        int32_t l = insn_size(location.segment, offs, sb, cpu,
                                           &output_ins, report_error);

                        /* if (using_debug_info)  && output_ins.opcode != -1) */
                        if (using_debug_info)
                        {       /* fbk 03/25/01 */
                            /* this is done here so we can do debug type info */
                            int32_t typeinfo =
                                TYS_ELEMENTS(output_ins.operands);
                            switch (output_ins.opcode) {
                            case I_RESB:
                                typeinfo =
                                    TYS_ELEMENTS(output_ins.oprs[0].
                                                 offset) | TY_BYTE;
                                break;
                            case I_RESW:
                                typeinfo =
                                    TYS_ELEMENTS(output_ins.oprs[0].
                                                 offset) | TY_WORD;
                                break;
                            case I_RESD:
                                typeinfo =
                                    TYS_ELEMENTS(output_ins.oprs[0].
                                                 offset) | TY_DWORD;
                                break;
                            case I_RESQ:
                                typeinfo =
                                    TYS_ELEMENTS(output_ins.oprs[0].
                                                 offset) | TY_QWORD;
                                break;
                            case I_REST:
                                typeinfo =
                                    TYS_ELEMENTS(output_ins.oprs[0].
                                                 offset) | TY_TBYTE;
                                break;
                            case I_DB:
                                typeinfo |= TY_BYTE;
                                break;
                            case I_DW:
                                typeinfo |= TY_WORD;
                                break;
                            case I_DD:
                                if (output_ins.eops_float)
                                    typeinfo |= TY_FLOAT;
                                else
                                    typeinfo |= TY_DWORD;
                                break;
                            case I_DQ:
                                typeinfo |= TY_QWORD;
                                break;
                            case I_DT:
                                typeinfo |= TY_TBYTE;
                                break;
			    case I_DO:
				typeinfo |= TY_OWORD;
				break;
                            default:
                                typeinfo = TY_LABEL;

                            }

                            ofmt->current_dfmt->debug_typevalue(typeinfo);

                        }
                        if (l != -1) {
                            offs += l;
                            SET_CURR_OFFS(offs);
                        }
                        /*
                         * else l == -1 => invalid instruction, which will be
                         * flagged as an error on pass 2
                         */

                    } else {    /* pass == 2 */
                        offs += assemble(location.segment, offs, sb, cpu,
                                         &output_ins, ofmt, report_error,
                                         &nasmlist);
                        SET_CURR_OFFS(offs);

                    }
                }               /* not an EQU */
                cleanup_insn(&output_ins);
            }
            nasm_free(line);
            location.offset = offs = GET_CURR_OFFS;
        }                       /* end while (line = preproc->getline... */

        if (pass1 == 2 && global_offset_changed)
            report_error(ERR_NONFATAL,
                         "phase error detected at end of assembly.");

        if (pass1 == 1)
            preproc->cleanup(1);

        if (pass1 == 1 && terminate_after_phase) {
            fclose(ofile);
            remove(outname);
            if (want_usage)
                usage();
            exit(1);
        }
        pass_cnt++;
        if (pass > 1 && !global_offset_changed) {
            pass0++;
            if (pass0 == 2)
                pass = pass_max - 1;
        } else if (!(optimizing > 0))
            pass0++;

    }                           /* for (pass=1; pass<=2; pass++) */

    preproc->cleanup(0);
    nasmlist.cleanup();
#if 1
    if (optimizing > 0 && opt_verbose_info)     /*  -On and -Ov switches */
        fprintf(stdout,
                "info:: assembly required 1+%d+1 passes\n", pass_cnt - 2);
#endif
}                               /* exit from assemble_file (...) */

static int getkw(char **directive, char **value)
{
    char *p, *q, *buf;

    buf = *directive;

    /*  allow leading spaces or tabs */
    while (*buf == ' ' || *buf == '\t')
        buf++;

    if (*buf != '[')
        return 0;

    p = buf;

    while (*p && *p != ']')
        p++;

    if (!*p)
        return 0;

    q = p++;

    while (*p && *p != ';') {
        if (!isspace(*p))
            return 0;
        p++;
    }
    q[1] = '\0';

    *directive = p = buf + 1;
    while (*buf && *buf != ' ' && *buf != ']' && *buf != '\t')
        buf++;
    if (*buf == ']') {
        *buf = '\0';
        *value = buf;
    } else {
        *buf++ = '\0';
        while (isspace(*buf))
            buf++;              /* beppu - skip leading whitespace */
        *value = buf;
        while (*buf != ']')
            buf++;
        *buf++ = '\0';
    }

    return bsii(*directive, directives, elements(directives));
}

/**
 * gnu style error reporting
 * This function prints an error message to error_file in the
 * style used by GNU. An example would be:
 * file.asm:50: error: blah blah blah
 * where file.asm is the name of the file, 50 is the line number on 
 * which the error occurs (or is detected) and "error:" is one of
 * the possible optional diagnostics -- it can be "error" or "warning"
 * or something else.  Finally the line terminates with the actual 
 * error message.
 * 
 * @param severity the severity of the warning or error 
 * @param fmt the printf style format string
 */
static void report_error_gnu(int severity, const char *fmt, ...)
{
    va_list ap;

    if (is_suppressed_warning(severity))
        return;

    if (severity & ERR_NOFILE)
        fputs("nasm: ", error_file);
    else {
        char *currentfile = NULL;
        int32_t lineno = 0;
        src_get(&lineno, &currentfile);
        fprintf(error_file, "%s:%"PRId32": ", currentfile, lineno);
        nasm_free(currentfile);
    }
    va_start(ap, fmt);
    report_error_common(severity, fmt, ap);
    va_end(ap);
}

/**
 * MS style error reporting
 * This function prints an error message to error_file in the
 * style used by Visual C and some other Microsoft tools. An example 
 * would be:
 * file.asm(50) : error: blah blah blah
 * where file.asm is the name of the file, 50 is the line number on 
 * which the error occurs (or is detected) and "error:" is one of
 * the possible optional diagnostics -- it can be "error" or "warning"
 * or something else.  Finally the line terminates with the actual 
 * error message.
 * 
 * @param severity the severity of the warning or error 
 * @param fmt the printf style format string
 */
static void report_error_vc(int severity, const char *fmt, ...)
{
    va_list ap;

    if (is_suppressed_warning(severity))
        return;

    if (severity & ERR_NOFILE)
        fputs("nasm: ", error_file);
    else {
        char *currentfile = NULL;
        int32_t lineno = 0;
        src_get(&lineno, &currentfile);
        fprintf(error_file, "%s(%"PRId32") : ", currentfile, lineno);
        nasm_free(currentfile);
    }
    va_start(ap, fmt);
    report_error_common(severity, fmt, ap);
    va_end(ap);
}

/**
 * check for supressed warning
 * checks for suppressed warning or pass one only warning and we're 
 * not in pass 1
 *
 * @param severity the severity of the warning or error
 * @return true if we should abort error/warning printing
 */
static int is_suppressed_warning(int severity)
{
    /*
     * See if it's a suppressed warning.
     */
    return ((severity & ERR_MASK) == ERR_WARNING &&
            (severity & ERR_WARN_MASK) != 0 &&
            suppressed[(severity & ERR_WARN_MASK) >> ERR_WARN_SHR]) ||
        /*
         * See if it's a pass-one only warning and we're not in pass one.
         */
        ((severity & ERR_PASS1) && pass0 == 2);
}

/**
 * common error reporting
 * This is the common back end of the error reporting schemes currently
 * implemented.  It prints the nature of the warning and then the 
 * specific error message to error_file and may or may not return.  It
 * doesn't return if the error severity is a "panic" or "debug" type.
 * 
 * @param severity the severity of the warning or error 
 * @param fmt the printf style format string
 */
static void report_error_common(int severity, const char *fmt,
                                va_list args)
{
    switch (severity & ERR_MASK) {
    case ERR_WARNING:
        fputs("warning: ", error_file);
        break;
    case ERR_NONFATAL:
        fputs("error: ", error_file);
        break;
    case ERR_FATAL:
        fputs("fatal: ", error_file);
        break;
    case ERR_PANIC:
        fputs("panic: ", error_file);
        break;
    case ERR_DEBUG:
        fputs("debug: ", error_file);
        break;
    }

    vfprintf(error_file, fmt, args);
    fputc('\n', error_file);

    if (severity & ERR_USAGE)
        want_usage = TRUE;

    switch (severity & ERR_MASK) {
    case ERR_WARNING:
    case ERR_DEBUG:
        /* no further action, by definition */
        break;
    case ERR_NONFATAL:
        /* hack enables listing(!) on errors */
        terminate_after_phase = TRUE;
        break;
    case ERR_FATAL:
        if (ofile) {
            fclose(ofile);
            remove(outname);
        }
        if (want_usage)
            usage();
        exit(1);                /* instantly die */
        break;                  /* placate silly compilers */
    case ERR_PANIC:
        fflush(NULL);
        /*	abort();	*//* halt, catch fire, and dump core */
        exit(3);
        break;
    }
}

static void usage(void)
{
    fputs("type `nasm -h' for help\n", error_file);
}

static void register_output_formats(void)
{
    ofmt = ofmt_register(report_error);
}

#define BUF_DELTA 512

static FILE *no_pp_fp;
static efunc no_pp_err;
static ListGen *no_pp_list;
static int32_t no_pp_lineinc;

static void no_pp_reset(char *file, int pass, efunc error, evalfunc eval,
                        ListGen * listgen)
{
    src_set_fname(nasm_strdup(file));
    src_set_linnum(0);
    no_pp_lineinc = 1;
    no_pp_err = error;
    no_pp_fp = fopen(file, "r");
    if (!no_pp_fp)
        no_pp_err(ERR_FATAL | ERR_NOFILE,
                  "unable to open input file `%s'", file);
    no_pp_list = listgen;
    (void)pass;                 /* placate compilers */
    (void)eval;                 /* placate compilers */
}

static char *no_pp_getline(void)
{
    char *buffer, *p, *q;
    int bufsize;

    bufsize = BUF_DELTA;
    buffer = nasm_malloc(BUF_DELTA);
    src_set_linnum(src_get_linnum() + no_pp_lineinc);

    while (1) {                 /* Loop to handle %line */

        p = buffer;
        while (1) {             /* Loop to handle long lines */
            q = fgets(p, bufsize - (p - buffer), no_pp_fp);
            if (!q)
                break;
            p += strlen(p);
            if (p > buffer && p[-1] == '\n')
                break;
            if (p - buffer > bufsize - 10) {
                int offset;
                offset = p - buffer;
                bufsize += BUF_DELTA;
                buffer = nasm_realloc(buffer, bufsize);
                p = buffer + offset;
            }
        }

        if (!q && p == buffer) {
            nasm_free(buffer);
            return NULL;
        }

        /*
         * Play safe: remove CRs, LFs and any spurious ^Zs, if any of
         * them are present at the end of the line.
         */
        buffer[strcspn(buffer, "\r\n\032")] = '\0';

        if (!nasm_strnicmp(buffer, "%line", 5)) {
            int32_t ln;
            int li;
            char *nm = nasm_malloc(strlen(buffer));
            if (sscanf(buffer + 5, "%"PRId32"+%d %s", &ln, &li, nm) == 3) {
                nasm_free(src_set_fname(nm));
                src_set_linnum(ln);
                no_pp_lineinc = li;
                continue;
            }
            nasm_free(nm);
        }
        break;
    }

    no_pp_list->line(LIST_READ, buffer);

    return buffer;
}

static void no_pp_cleanup(int pass)
{
    (void)pass;                     /* placate GCC */
    fclose(no_pp_fp);
}

static uint32_t get_cpu(char *value)
{

    if (!strcmp(value, "8086"))
        return IF_8086;
    if (!strcmp(value, "186"))
        return IF_186;
    if (!strcmp(value, "286"))
        return IF_286;
    if (!strcmp(value, "386"))
        return IF_386;
    if (!strcmp(value, "486"))
        return IF_486;
    if (!strcmp(value, "586") || !nasm_stricmp(value, "pentium"))
        return IF_PENT;
    if (!strcmp(value, "686") ||
        !nasm_stricmp(value, "ppro") ||
        !nasm_stricmp(value, "pentiumpro") || !nasm_stricmp(value, "p2"))
        return IF_P6;
    if (!nasm_stricmp(value, "p3") || !nasm_stricmp(value, "katmai"))
        return IF_KATMAI;
    if (!nasm_stricmp(value, "p4") ||   /* is this right? -- jrc */
        !nasm_stricmp(value, "willamette"))
        return IF_WILLAMETTE;
    if (!nasm_stricmp(value, "prescott"))
        return IF_PRESCOTT;
    if (!nasm_stricmp(value, "x64") ||
        !nasm_stricmp(value, "x86-64"))
        return IF_X86_64;
    if (!nasm_stricmp(value, "ia64") ||
        !nasm_stricmp(value, "ia-64") ||
        !nasm_stricmp(value, "itanium") ||
        !nasm_stricmp(value, "itanic") || !nasm_stricmp(value, "merced"))
        return IF_IA64;

    report_error(pass0 < 2 ? ERR_NONFATAL : ERR_FATAL,
                 "unknown 'cpu' type");

    return IF_PLEVEL;           /* the maximum level */
}

static int get_bits(char *value)
{
    int i;

    if ((i = atoi(value)) == 16)
        return i;               /* set for a 16-bit segment */
    else if (i == 32) {
        if (cpu < IF_386) {
            report_error(ERR_NONFATAL,
                         "cannot specify 32-bit segment on processor below a 386");
            i = 16;
        }
    } else if (i == 64) {
        if (cpu < IF_X86_64) {
            report_error(ERR_NONFATAL,
                         "cannot specify 64-bit segment on processor below an x86-64");
            i = 16;
        }
        if (i != maxbits) {
            report_error(ERR_NONFATAL,
                         "%s output format does not support 64-bit code",
                         ofmt->shortname);
            i = 16;
        }
    } else {
        report_error(pass0 < 2 ? ERR_NONFATAL : ERR_FATAL,
                     "`%s' is not a valid segment size; must be 16, 32 or 64",
                     value);
        i = 16;
    }
    return i;
}

/* end of nasm.c */