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OS/2 Shareware BBS: 10 Tools
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LIBSRC.ZOO
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libsrc
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nlist.c
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C/C++ Source or Header
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1992-02-01
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4KB
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123 lines
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)nlist.c 5.8 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/file.h>
#include <a.out.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
typedef struct nlist NLIST;
#define _strx n_un.n_strx
#define _name n_un.n_name
#define ISVALID(p) (p->_name && p->_name[0])
int
nlist(name, list)
const char *name;
NLIST *list;
{
register NLIST *p, *s;
struct exec ebuf;
FILE *fstr, *fsym;
NLIST nbuf;
off_t strings_offset, symbol_offset, symbol_size, lseek();
int entries, len, maxlen;
char sbuf[256];
entries = -1;
if (!(fsym = fopen(name, "r")))
return(-1);
if (fread((char *)&ebuf, sizeof(struct exec), 1, fsym) != 1 ||
N_BADMAG(ebuf))
goto done1;
symbol_offset = N_SYMOFF(ebuf);
symbol_size = ebuf.a_syms;
strings_offset = symbol_offset + symbol_size;
if (fseek(fsym, symbol_offset, SEEK_SET))
goto done1;
if (!(fstr = fopen(name, "r")))
goto done1;
/*
* clean out any left-over information for all valid entries.
* Type and value defined to be 0 if not found; historical
* versions cleared other and desc as well. Also figure out
* the largest string length so don't read any more of the
* string table than we have to.
*/
for (p = list, entries = maxlen = 0; ISVALID(p); ++p, ++entries) {
p->n_type = 0;
p->n_other = 0;
p->n_desc = 0;
p->n_value = 0;
if ((len = strlen(p->_name)) > maxlen)
maxlen = len;
}
if (++maxlen > sizeof(sbuf)) { /* for the NULL */
(void)fprintf(stderr, "nlist: symbol too large.\n");
entries = -1;
goto done2;
}
for (s = &nbuf; symbol_size; symbol_size -= sizeof(NLIST)) {
if (fread((char *)s, sizeof(NLIST), 1, fsym) != 1)
goto done2;
if (!s->_strx || s->n_type&N_STAB)
continue;
if (fseek(fstr, strings_offset + s->_strx, SEEK_SET))
goto done2;
(void)fread(sbuf, sizeof(sbuf[0]), maxlen, fstr);
for (p = list; ISVALID(p); p++)
if (!strcmp(p->_name, sbuf)) {
p->n_value = s->n_value;
p->n_type = s->n_type;
p->n_desc = s->n_desc;
p->n_other = s->n_other;
if (!--entries)
goto done2;
}
}
done2: (void)fclose(fstr);
done1: (void)fclose(fsym);
return(entries);
}