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;
  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     fp = fopen(filename, "rb");
  73     strcpy(lastverified, filename);
  74
  75     if (!fp)
  76         return (rdl_error = lastresult = 1);
  77
  78     while (!feof(fp)) {
  79         i = 0;
  80
  81         while (fread(buf + i, 1, 1, fp) == 1 && i < 257 && buf[i])
  82             i++;
  83         if (feof(fp))
  84             break;
  85
  86         if (buf[0] == '.') {
  87             /*
  88              * A special module, eg a signature block or a directory.
  89              * Format of such a module is defined to be:
  90              *   six char type identifier
  91              *   int32_t count bytes content
  92              *   content
  93              * so we can handle it uniformaly with RDOFF2 modules.
  94              */
  95             fread(buf, 6, 1, fp);
  96             buf[6] = 0;
  97             /* Currently, nothing useful to do with signature block.. */
  98         } else {
  99             fread(buf, 6, 1, fp);
 100             buf[6] = 0;
 101             if (strncmp(buf, "RDOFF", 5)) {
 102                 return rdl_error = lastresult = 2;
 103             } else if (buf[5] != '2') {
 104                 return rdl_error = lastresult = 3;
 105             }
 106         }
 107         fread(&length, 4, 1, fp);
 108         fseek(fp, length, SEEK_CUR);    /* skip over the module */
 109     }
 110     fclose(fp);
 111     return lastresult = 0;      /* library in correct format */
 112 }
 113
 114 int rdl_open(struct librarynode *lib, const char *name)
 115 {
 116     int i = rdl_verify(name);
 117     if (i)
 118         return i;
 119
 120     lib->fp = NULL;
 121     lib->name = strdup(name);
 122     lib->referenced = 0;
 123     lib->next = NULL;
 124     return 0;
 125 }
 126
 127 void rdl_close(struct librarynode *lib)
 128 {
 129     if (lib->fp)
 130         fclose(lib->fp);
 131     free(lib->name);
 132 }
 133
 134 int rdl_searchlib(struct librarynode *lib, const char *label, rdffile * f)
 135 {
 136     char buf[512];
 137     int i, t;
 138     void *hdr;
 139     rdfheaderrec *r;
 140     int32_t l;
 141
 142     rdl_error = 0;
 143     lib->referenced++;
 144
 145     if (!lib->fp) {
 146         lib->fp = fopen(lib->name, "rb");
 147
 148         if (!lib->fp) {
 149             rdl_error = 1;
 150             return 0;
 151         }
 152     } else
 153         rewind(lib->fp);
 154
 155     while (!feof(lib->fp)) {
 156         /*
 157          * read the module name from the file, and prepend
 158          * the library name and '.' to it.
 159          */
 160         strcpy(buf, lib->name);
 161
 162         i = strlen(lib->name);
 163         buf[i++] = '.';
 164         t = i;
 165         while (fread(buf + i, 1, 1, lib->fp) == 1 && i < 512 && buf[i])
 166             i++;
 167
 168         buf[i] = 0;
 169
 170         if (feof(lib->fp))
 171             break;
 172         if (!strcmp(buf + t, ".dir")) { /* skip over directory */
 173             fread(&l, 4, 1, lib->fp);
 174             fseek(lib->fp, l, SEEK_CUR);
 175             continue;
 176         }
 177         /*
 178          * open the RDOFF module
 179          */
 180         if (rdfopenhere(f, lib->fp, &lib->referenced, buf)) {
 181             rdl_error = 16 * rdf_errno;
 182             return 0;
 183         }
 184         /*
 185          * read in the header, and scan for exported symbols
 186          */
 187         hdr = malloc(f->header_len);
 188         rdfloadseg(f, RDOFF_HEADER, hdr);
 189
 190         while ((r = rdfgetheaderrec(f))) {
 191             if (r->type != 3)   /* not an export */
 192                 continue;
 193
 194             if (!strcmp(r->e.label, label)) {   /* match! */
 195                 free(hdr);      /* reset to 'just open' */
 196                 f->header_loc = NULL;   /* state... */
 197                 f->header_fp = 0;
 198                 return 1;
 199             }
 200         }
 201
 202         /* find start of next module... */
 203         i = f->eof_offset;
 204         rdfclose(f);
 205         fseek(lib->fp, i, SEEK_SET);
 206     }
 207
 208     /*
 209      * close the file if nobody else is using it
 210      */
 211     lib->referenced--;
 212     if (!lib->referenced) {
 213         fclose(lib->fp);
 214         lib->fp = NULL;
 215     }
 216     return 0;
 217 }
 218
 219 int rdl_openmodule(struct librarynode *lib, int moduleno, rdffile * f)
 220 {
 221     char buf[512];
 222     int i, cmod, t;
 223     int32_t length;
 224
 225     lib->referenced++;
 226
 227     if (!lib->fp) {
 228         lib->fp = fopen(lib->name, "rb");
 229         if (!lib->fp) {
 230             lib->referenced--;
 231             return (rdl_error = 1);
 232         }
 233     } else
 234         rewind(lib->fp);
 235
 236     cmod = -1;
 237     while (!feof(lib->fp)) {
 238         strcpy(buf, lib->name);
 239         i = strlen(buf);
 240         buf[i++] = '.';
 241         t = i;
 242         while (fread(buf + i, 1, 1, lib->fp) == 1 && i < 512 && buf[i])
 243             i++;
 244         buf[i] = 0;
 245         if (feof(lib->fp))
 246             break;
 247
 248         if (buf[t] != '.')      /* special module - not counted in the numbering */
 249             cmod++;             /* of RDOFF modules - must be referred to by name */
 250
 251         if (cmod == moduleno) {
 252             rdl_error = 16 *
 253                 rdfopenhere(f, lib->fp, &lib->referenced, buf);
 254             lib->referenced--;
 255             if (!lib->referenced) {
 256                 fclose(lib->fp);
 257                 lib->fp = NULL;
 258             }
 259             return rdl_error;
 260         }
 261
 262         fread(buf, 6, 1, lib->fp);
 263         buf[6] = 0;
 264         if (buf[t] == '.') {
 265             /* do nothing */
 266         } else if (strncmp(buf, "RDOFF", 5)) {
 267             if (!--lib->referenced) {
 268                 fclose(lib->fp);
 269                 lib->fp = NULL;
 270             }
 271             return rdl_error = 2;
 272         } else if (buf[5] != '2') {
 273             if (!--lib->referenced) {
 274                 fclose(lib->fp);
 275                 lib->fp = NULL;
 276             }
 277             return rdl_error = 3;
 278         }
 279
 280         fread(&length, 4, 1, lib->fp);
 281         fseek(lib->fp, length, SEEK_CUR);       /* skip over the module */
 282     }
 283     if (!--lib->referenced) {
 284         fclose(lib->fp);
 285         lib->fp = NULL;
 286     }
 287     return rdl_error = 4;       /* module not found */
 288 }
 289
 290 void rdl_perror(const char *apname, const char *filename)
 291 {
 292     if (rdl_error >= 16)
 293         rdfperror(apname, filename);
 294     else
 295         fprintf(stderr, "%s:%s:%s\n", apname, filename,
 296                 rdl_errors[rdl_error]);
 297 }