rdoff/rdlib.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2009 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  * rdlib.c - routines for manipulating RDOFF libraries (.rdl)
  36  */
  37
  38 #include "compiler.h"
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 #define RDOFF_UTILS
  45
  46 #include "rdoff.h"
  47 #include "rdlib.h"
  48 #include "rdlar.h"
  49
  50 /* See Texinfo documentation about new RDOFF libraries format */
  51
  52 int rdl_error = 0;
  53
  54 char *rdl_errors[5] = {
  55     "no error", "could not open file", "invalid file structure",
  56     "file contains modules of an unsupported RDOFF version",
  57     "module not found"
  58 };
  59
  60 int rdl_verify(const char *filename)
  61 {
  62     FILE *fp = fopen(filename, "rb");
  63     char buf[257];
  64     int i;
  65     int32_t length;
  66     static char lastverified[256];
  67     static int lastresult = -1;
  68
  69     if (lastresult != -1 && !strcmp(filename, lastverified))
  70         return lastresult;
  71
  72     strcpy(lastverified, filename);
  73
  74     if (!fp)
  75         return (rdl_error = lastresult = 1);
  76
  77     while (!feof(fp)) {
  78         i = 0;
  79
  80         while (fread(buf + i, 1, 1, fp) == 1 && buf[i] && i < 257)
  81             i++;
  82         if (feof(fp))
  83             break;
  84
  85         if (buf[0] == '.') {
  86             /*
  87              * A special module, eg a signature block or a directory.
  88              * Format of such a module is defined to be:
  89              *   six char type identifier
  90              *   int32_t count bytes content
  91              *   content
  92              * so we can handle it uniformaly with RDOFF2 modules.
  93              */
  94             fread(buf, 6, 1, fp);
  95             buf[6] = 0;
  96             /* Currently, nothing useful to do with signature block.. */
  97         } else {
  98             fread(buf, 6, 1, fp);
  99             buf[6] = 0;
 100             if (strncmp(buf, "RDOFF", 5)) {
 101                 return rdl_error = lastresult = 2;
 102             } else if (buf[5] != '2') {
 103                 return rdl_error = lastresult = 3;
 104             }
 105         }
 106         fread(&length, 4, 1, fp);
 107         fseek(fp, length, SEEK_CUR);    /* skip over the module */
 108     }
 109     fclose(fp);
 110     return lastresult = 0;      /* library in correct format */
 111 }
 112
 113 int rdl_open(struct librarynode *lib, const char *name)
 114 {
 115     int i = rdl_verify(name);
 116     if (i)
 117         return i;
 118
 119     lib->fp = NULL;
 120     lib->name = strdup(name);
 121     lib->referenced = 0;
 122     lib->next = NULL;
 123     return 0;
 124 }
 125
 126 void rdl_close(struct librarynode *lib)
 127 {
 128     if (lib->fp)
 129         fclose(lib->fp);
 130     free(lib->name);
 131 }
 132
 133 int rdl_searchlib(struct librarynode *lib, const char *label, rdffile * f)
 134 {
 135     char buf[512];
 136     int i, t;
 137     void *hdr;
 138     rdfheaderrec *r;
 139     int32_t l;
 140
 141     rdl_error = 0;
 142     lib->referenced++;
 143
 144     if (!lib->fp) {
 145         lib->fp = fopen(lib->name, "rb");
 146
 147         if (!lib->fp) {
 148             rdl_error = 1;
 149             return 0;
 150         }
 151     } else
 152         rewind(lib->fp);
 153
 154     while (!feof(lib->fp)) {
 155         /*
 156          * read the module name from the file, and prepend
 157          * the library name and '.' to it.
 158          */
 159         strcpy(buf, lib->name);
 160
 161         i = strlen(lib->name);
 162         buf[i++] = '.';
 163         t = i;
 164         while (fread(buf + i, 1, 1, lib->fp) == 1 && buf[i] && i < 512)
 165             i++;
 166
 167         buf[i] = 0;
 168
 169         if (feof(lib->fp))
 170             break;
 171         if (!strcmp(buf + t, ".dir")) { /* skip over directory */
 172             fread(&l, 4, 1, lib->fp);
 173             fseek(lib->fp, l, SEEK_CUR);
 174             continue;
 175         }
 176         /*
 177          * open the RDOFF module
 178          */
 179         if (rdfopenhere(f, lib->fp, &lib->referenced, buf)) {
 180             rdl_error = 16 * rdf_errno;
 181             return 0;
 182         }
 183         /*
 184          * read in the header, and scan for exported symbols
 185          */
 186         hdr = malloc(f->header_len);
 187         rdfloadseg(f, RDOFF_HEADER, hdr);
 188
 189         while ((r = rdfgetheaderrec(f))) {
 190             if (r->type != 3)   /* not an export */
 191                 continue;
 192
 193             if (!strcmp(r->e.label, label)) {   /* match! */
 194                 free(hdr);      /* reset to 'just open' */
 195                 f->header_loc = NULL;   /* state... */
 196                 f->header_fp = 0;
 197                 return 1;
 198             }
 199         }
 200
 201         /* find start of next module... */
 202         i = f->eof_offset;
 203         rdfclose(f);
 204         fseek(lib->fp, i, SEEK_SET);
 205     }
 206
 207     /*
 208      * close the file if nobody else is using it
 209      */
 210     lib->referenced--;
 211     if (!lib->referenced) {
 212         fclose(lib->fp);
 213         lib->fp = NULL;
 214     }
 215     return 0;
 216 }
 217
 218 int rdl_openmodule(struct librarynode *lib, int moduleno, rdffile * f)
 219 {
 220     char buf[512];
 221     int i, cmod, t;
 222     int32_t length;
 223
 224     lib->referenced++;
 225
 226     if (!lib->fp) {
 227         lib->fp = fopen(lib->name, "rb");
 228         if (!lib->fp) {
 229             lib->referenced--;
 230             return (rdl_error = 1);
 231         }
 232     } else
 233         rewind(lib->fp);
 234
 235     cmod = -1;
 236     while (!feof(lib->fp)) {
 237         strcpy(buf, lib->name);
 238         i = strlen(buf);
 239         buf[i++] = '.';
 240         t = i;
 241         while (fread(buf + i, 1, 1, lib->fp) == 1 && buf[i] && i < 512)
 242             i++;
 243         buf[i] = 0;
 244         if (feof(lib->fp))
 245             break;
 246
 247         if (buf[t] != '.')      /* special module - not counted in the numbering */
 248             cmod++;             /* of RDOFF modules - must be referred to by name */
 249
 250         if (cmod == moduleno) {
 251             rdl_error = 16 *
 252                 rdfopenhere(f, lib->fp, &lib->referenced, buf);
 253             lib->referenced--;
 254             if (!lib->referenced) {
 255                 fclose(lib->fp);
 256                 lib->fp = NULL;
 257             }
 258             return rdl_error;
 259         }
 260
 261         fread(buf, 6, 1, lib->fp);
 262         buf[6] = 0;
 263         if (buf[t] == '.') {
 264             /* do nothing */
 265         } else if (strncmp(buf, "RDOFF", 5)) {
 266             if (!--lib->referenced) {
 267                 fclose(lib->fp);
 268                 lib->fp = NULL;
 269             }
 270             return rdl_error = 2;
 271         } else if (buf[5] != '2') {
 272             if (!--lib->referenced) {
 273                 fclose(lib->fp);
 274                 lib->fp = NULL;
 275             }
 276             return rdl_error = 3;
 277         }
 278
 279         fread(&length, 4, 1, lib->fp);
 280         fseek(lib->fp, length, SEEK_CUR);       /* skip over the module */
 281     }
 282     if (!--lib->referenced) {
 283         fclose(lib->fp);
 284         lib->fp = NULL;
 285     }
 286     return rdl_error = 4;       /* module not found */
 287 }
 288
 289 void rdl_perror(const char *apname, const char *filename)
 290 {
 291     if (rdl_error >= 16)
 292         rdfperror(apname, filename);
 293     else
 294         fprintf(stderr, "%s:%s:%s\n", apname, filename,
 295                 rdl_errors[rdl_error]);
 296 }