asm/preproc-nop.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2016 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * This is a null preprocessor which just copies lines from input
  36  * to output. It's used when someone explicitly requests that NASM
  37  * not preprocess their source file.
  38  */
  39
  40 #include "compiler.h"
  41
  42 #include <stdio.h>
  43 #include <stdarg.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <ctype.h>
  47 #include <limits.h>
  48 #include <time.h>
  49
  50 #include "nasm.h"
  51 #include "nasmlib.h"
  52 #include "preproc.h"
  53 #include "listing.h"
  54
  55 #define BUF_DELTA 512
  56
  57 static FILE *nop_fp;
  58 static int32_t nop_lineinc;
  59
  60 static void nop_init(void)
  61 {
  62     /* Nothing to do */
  63 }
  64
  65 static void nop_reset(char *file, int pass, StrList **deplist)
  66 {
  67     src_set(0, file);
  68     nop_lineinc = 1;
  69     nop_fp = nasm_open_read(file, NF_TEXT);
  70
  71     if (!nop_fp)
  72         nasm_fatal(ERR_NOFILE, "unable to open input file `%s'", file);
  73     (void)pass;                 /* placate compilers */
  74
  75     nasm_add_string_to_strlist(deplist, file);
  76 }
  77
  78 static char *nop_getline(void)
  79 {
  80     char *buffer, *p, *q;
  81     int bufsize;
  82
  83     bufsize = BUF_DELTA;
  84     buffer = nasm_malloc(BUF_DELTA);
  85     src_set_linnum(src_get_linnum() + nop_lineinc);
  86
  87     while (1) {                 /* Loop to handle %line */
  88
  89         p = buffer;
  90         while (1) {             /* Loop to handle long lines */
  91             q = fgets(p, bufsize - (p - buffer), nop_fp);
  92             if (!q)
  93                 break;
  94             p += strlen(p);
  95             if (p > buffer && p[-1] == '\n')
  96                 break;
  97             if (p - buffer > bufsize - 10) {
  98                 int offset;
  99                 offset = p - buffer;
 100                 bufsize += BUF_DELTA;
 101                 buffer = nasm_realloc(buffer, bufsize);
 102                 p = buffer + offset;
 103             }
 104         }
 105
 106         if (!q && p == buffer) {
 107             nasm_free(buffer);
 108             return NULL;
 109         }
 110
 111         /*
 112          * Play safe: remove CRs, LFs and any spurious ^Zs, if any of
 113          * them are present at the end of the line.
 114          */
 115         buffer[strcspn(buffer, "\r\n\032")] = '\0';
 116
 117         if (!nasm_strnicmp(buffer, "%line", 5)) {
 118             int32_t ln;
 119             int li;
 120             char *nm = nasm_malloc(strlen(buffer));
 121             if (sscanf(buffer + 5, "%"PRId32"+%d %s", &ln, &li, nm) == 3) {
 122                 src_set(ln, nm);
 123                 nop_lineinc = li;
 124                 nasm_free(nm);
 125                 continue;
 126             }
 127             nasm_free(nm);
 128         }
 129         break;
 130     }
 131
 132     lfmt->line(LIST_READ, buffer);
 133
 134     return buffer;
 135 }
 136
 137 static void nop_cleanup(int pass)
 138 {
 139     (void)pass;                     /* placate GCC */
 140     if (nop_fp) {
 141         fclose(nop_fp);
 142         nop_fp = NULL;
 143     }
 144 }
 145
 146 static void nop_extra_stdmac(macros_t *macros)
 147 {
 148     (void)macros;
 149 }
 150
 151 static void nop_pre_define(char *definition)
 152 {
 153     (void)definition;
 154 }
 155
 156 static void nop_pre_undefine(char *definition)
 157 {
 158     (void)definition;
 159 }
 160
 161 static void nop_pre_include(char *fname)
 162 {
 163     (void)fname;
 164 }
 165
 166 static void nop_include_path(char *path)
 167 {
 168     (void)path;
 169 }
 170
 171 static void nop_error_list_macros(int severity)
 172 {
 173     (void)severity;
 174 }
 175
 176 const struct preproc_ops preproc_nop = {
 177     nop_init,
 178     nop_reset,
 179     nop_getline,
 180     nop_cleanup,
 181     nop_extra_stdmac,
 182     nop_pre_define,
 183     nop_pre_undefine,
 184     nop_pre_include,
 185     nop_include_path,
 186     nop_error_list_macros,
 187 };