150 lines
4.5 KiB
C
150 lines
4.5 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)nlist.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <errno.h>
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#include <a.out.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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int
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nlist(name, list)
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const char *name;
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struct nlist *list;
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{
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int fd, n;
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fd = open(name, O_RDONLY, 0);
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if (fd < 0)
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return (-1);
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n = __fdnlist(fd, list);
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(void)close(fd);
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return (n);
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}
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#define ISLAST(p) (p->n_un.n_name == 0 || p->n_un.n_name[0] == 0)
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int
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__fdnlist(fd, list)
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register int fd;
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register struct nlist *list;
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{
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register struct nlist *p, *s;
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register caddr_t strtab;
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register off_t stroff, symoff;
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register u_long symsize;
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register int nent, cc;
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size_t strsize;
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struct nlist nbuf[1024];
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struct exec exec;
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struct stat st;
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if (lseek(fd, (off_t)0, SEEK_SET) == -1 ||
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read(fd, &exec, sizeof(exec)) != sizeof(exec) ||
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N_BADMAG(exec) || fstat(fd, &st) < 0)
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return (-1);
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symoff = N_SYMOFF(exec);
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symsize = exec.a_syms;
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stroff = symoff + symsize;
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/* Check for files too large to mmap. */
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if (st.st_size - stroff > SIZE_T_MAX) {
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errno = EFBIG;
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return (-1);
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}
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/*
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* Map string table into our address space. This gives us
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* an easy way to randomly access all the strings, without
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* making the memory allocation permanent as with malloc/free
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* (i.e., munmap will return it to the system).
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*/
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strsize = st.st_size - stroff;
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strtab = mmap(NULL, (size_t)strsize, PROT_READ, 0, fd, stroff);
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if (strtab == (char *)-1)
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return (-1);
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/*
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* clean out any left-over information for all valid entries.
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* Type and value defined to be 0 if not found; historical
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* versions cleared other and desc as well. Also figure out
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* the largest string length so don't read any more of the
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* string table than we have to.
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*
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* XXX clearing anything other than n_type and n_value violates
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* the semantics given in the man page.
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*/
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nent = 0;
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for (p = list; !ISLAST(p); ++p) {
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p->n_type = 0;
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p->n_other = 0;
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p->n_desc = 0;
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p->n_value = 0;
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++nent;
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}
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if (lseek(fd, symoff, SEEK_SET) == -1)
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return (-1);
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while (symsize > 0) {
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cc = MIN(symsize, sizeof(nbuf));
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if (read(fd, nbuf, cc) != cc)
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break;
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symsize -= cc;
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for (s = nbuf; cc > 0; ++s, cc -= sizeof(*s)) {
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register int soff = s->n_un.n_strx;
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if (soff == 0 || (s->n_type & N_STAB) != 0)
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continue;
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for (p = list; !ISLAST(p); p++)
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if (!strcmp(&strtab[soff], p->n_un.n_name)) {
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p->n_value = s->n_value;
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p->n_type = s->n_type;
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p->n_desc = s->n_desc;
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p->n_other = s->n_other;
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if (--nent <= 0)
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break;
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}
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}
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}
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munmap(strtab, strsize);
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return (nent);
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}
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