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/*
* rdlib.c - routines for manipulating RDOFF libraries (.rdl)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define RDOFF_UTILS
#include "rdoff.h"
#include "rdlib.h"
#include "rdlar.h"
/* See Texinfo documentation about new RDOFF libraries format */
int rdl_error = 0;
int8_t *rdl_errors[5] = {
"no error", "could not open file", "invalid file structure",
"file contains modules of an unsupported RDOFF version",
"module not found"
};
int rdl_verify(const int8_t *filename)
{
FILE *fp = fopen(filename, "rb");
int8_t buf[257];
int i;
int32_t length;
static int8_t lastverified[256];
static int lastresult = -1;
if (lastresult != -1 && !strcmp(filename, lastverified))
return lastresult;
strcpy(lastverified, filename);
if (!fp)
return (rdl_error = lastresult = 1);
while (!feof(fp)) {
i = 0;
while (fread(buf + i, 1, 1, fp) == 1 && buf[i] && i < 257)
i++;
if (feof(fp))
break;
if (buf[0] == '.') {
/*
* A special module, eg a signature block or a directory.
* Format of such a module is defined to be:
* six int8_t type identifier
* int32_t count bytes content
* content
* so we can handle it uniformaly with RDOFF2 modules.
*/
fread(buf, 6, 1, fp);
buf[6] = 0;
/* Currently, nothing useful to do with signature block.. */
} else {
fread(buf, 6, 1, fp);
buf[6] = 0;
if (strncmp(buf, "RDOFF", 5)) {
return rdl_error = lastresult = 2;
} else if (buf[5] != '2') {
return rdl_error = lastresult = 3;
}
}
fread(&length, 4, 1, fp);
fseek(fp, length, SEEK_CUR); /* skip over the module */
}
fclose(fp);
return lastresult = 0; /* library in correct format */
}
int rdl_open(struct librarynode *lib, const int8_t *name)
{
int i = rdl_verify(name);
if (i)
return i;
lib->fp = NULL;
lib->name = strdup(name);
lib->referenced = 0;
lib->next = NULL;
return 0;
}
void rdl_close(struct librarynode *lib)
{
if (lib->fp)
fclose(lib->fp);
free(lib->name);
}
int rdl_searchlib(struct librarynode *lib, const int8_t *label, rdffile * f)
{
int8_t buf[512];
int i, t;
void *hdr;
rdfheaderrec *r;
int32_t l;
rdl_error = 0;
lib->referenced++;
if (!lib->fp) {
lib->fp = fopen(lib->name, "rb");
if (!lib->fp) {
rdl_error = 1;
return 0;
}
} else
rewind(lib->fp);
while (!feof(lib->fp)) {
/*
* read the module name from the file, and prepend
* the library name and '.' to it.
*/
strcpy(buf, lib->name);
i = strlen(lib->name);
buf[i++] = '.';
t = i;
while (fread(buf + i, 1, 1, lib->fp) == 1 && buf[i] && i < 512)
i++;
buf[i] = 0;
if (feof(lib->fp))
break;
if (!strcmp(buf + t, ".dir")) { /* skip over directory */
fread(&l, 4, 1, lib->fp);
fseek(lib->fp, l, SEEK_CUR);
continue;
}
/*
* open the RDOFF module
*/
if (rdfopenhere(f, lib->fp, &lib->referenced, buf)) {
rdl_error = 16 * rdf_errno;
return 0;
}
/*
* read in the header, and scan for exported symbols
*/
hdr = malloc(f->header_len);
rdfloadseg(f, RDOFF_HEADER, hdr);
while ((r = rdfgetheaderrec(f))) {
if (r->type != 3) /* not an export */
continue;
if (!strcmp(r->e.label, label)) { /* match! */
free(hdr); /* reset to 'just open' */
f->header_loc = NULL; /* state... */
f->header_fp = 0;
return 1;
}
}
/* find start of next module... */
i = f->eof_offset;
rdfclose(f);
fseek(lib->fp, i, SEEK_SET);
}
/*
* close the file if nobody else is using it
*/
lib->referenced--;
if (!lib->referenced) {
fclose(lib->fp);
lib->fp = NULL;
}
return 0;
}
int rdl_openmodule(struct librarynode *lib, int moduleno, rdffile * f)
{
int8_t buf[512];
int i, cmod, t;
int32_t length;
lib->referenced++;
if (!lib->fp) {
lib->fp = fopen(lib->name, "rb");
if (!lib->fp) {
lib->referenced--;
return (rdl_error = 1);
}
} else
rewind(lib->fp);
cmod = -1;
while (!feof(lib->fp)) {
strcpy(buf, lib->name);
i = strlen(buf);
buf[i++] = '.';
t = i;
while (fread(buf + i, 1, 1, lib->fp) == 1 && buf[i] && i < 512)
i++;
buf[i] = 0;
if (feof(lib->fp))
break;
if (buf[t] != '.') /* special module - not counted in the numbering */
cmod++; /* of RDOFF modules - must be referred to by name */
if (cmod == moduleno) {
rdl_error = 16 *
rdfopenhere(f, lib->fp, &lib->referenced, buf);
lib->referenced--;
if (!lib->referenced) {
fclose(lib->fp);
lib->fp = NULL;
}
return rdl_error;
}
fread(buf, 6, 1, lib->fp);
buf[6] = 0;
if (buf[t] == '.') {
/* do nothing */
} else if (strncmp(buf, "RDOFF", 5)) {
if (!--lib->referenced) {
fclose(lib->fp);
lib->fp = NULL;
}
return rdl_error = 2;
} else if (buf[5] != '2') {
if (!--lib->referenced) {
fclose(lib->fp);
lib->fp = NULL;
}
return rdl_error = 3;
}
fread(&length, 4, 1, lib->fp);
fseek(lib->fp, length, SEEK_CUR); /* skip over the module */
}
if (!--lib->referenced) {
fclose(lib->fp);
lib->fp = NULL;
}
return rdl_error = 4; /* module not found */
}
void rdl_perror(const int8_t *apname, const int8_t *filename)
{
if (rdl_error >= 16)
rdfperror(apname, filename);
else
fprintf(stderr, "%s:%s:%s\n", apname, filename,
rdl_errors[rdl_error]);
}
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