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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #if defined(LIBC_SCCS) && !defined(lint) | |
35 | static char sccsid[] = "@(#)nlist.c 5.8 (Berkeley) 2/23/91"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | ||
38 | #include <sys/types.h> | |
39 | #include <sys/file.h> | |
40 | #include <a.out.h> | |
41 | #include <stdio.h> | |
42 | #include <string.h> | |
43 | #include <unistd.h> | |
44 | ||
45 | typedef struct nlist NLIST; | |
46 | #define _strx n_un.n_strx | |
47 | #define _name n_un.n_name | |
48 | #define ISVALID(p) (p->_name && p->_name[0]) | |
49 | ||
50 | int | |
51 | nlist(name, list) | |
52 | const char *name; | |
53 | NLIST *list; | |
54 | { | |
55 | register NLIST *p, *s; | |
56 | struct exec ebuf; | |
57 | FILE *fstr, *fsym; | |
58 | NLIST nbuf; | |
59 | off_t strings_offset, symbol_offset, symbol_size, lseek(); | |
60 | int entries, len, maxlen; | |
61 | char sbuf[256]; | |
62 | ||
63 | entries = -1; | |
64 | ||
65 | if (!(fsym = fopen(name, "r"))) | |
66 | return(-1); | |
67 | if (fread((char *)&ebuf, sizeof(struct exec), 1, fsym) != 1 || | |
68 | N_BADMAG(ebuf)) | |
69 | goto done1; | |
70 | ||
71 | symbol_offset = N_SYMOFF(ebuf); | |
72 | symbol_size = ebuf.a_syms; | |
73 | strings_offset = symbol_offset + symbol_size; | |
74 | if (fseek(fsym, symbol_offset, SEEK_SET)) | |
75 | goto done1; | |
76 | ||
77 | if (!(fstr = fopen(name, "r"))) | |
78 | goto done1; | |
79 | ||
80 | /* | |
81 | * clean out any left-over information for all valid entries. | |
82 | * Type and value defined to be 0 if not found; historical | |
83 | * versions cleared other and desc as well. Also figure out | |
84 | * the largest string length so don't read any more of the | |
85 | * string table than we have to. | |
86 | */ | |
87 | for (p = list, entries = maxlen = 0; ISVALID(p); ++p, ++entries) { | |
88 | p->n_type = 0; | |
89 | p->n_other = 0; | |
90 | p->n_desc = 0; | |
91 | p->n_value = 0; | |
92 | if ((len = strlen(p->_name)) > maxlen) | |
93 | maxlen = len; | |
94 | } | |
95 | if (++maxlen > sizeof(sbuf)) { /* for the NULL */ | |
96 | (void)fprintf(stderr, "nlist: symbol too large.\n"); | |
97 | entries = -1; | |
98 | goto done2; | |
99 | } | |
100 | ||
101 | for (s = &nbuf; symbol_size; symbol_size -= sizeof(NLIST)) { | |
102 | if (fread((char *)s, sizeof(NLIST), 1, fsym) != 1) | |
103 | goto done2; | |
104 | if (!s->_strx || s->n_type&N_STAB) | |
105 | continue; | |
106 | if (fseek(fstr, strings_offset + s->_strx, SEEK_SET)) | |
107 | goto done2; | |
108 | (void)fread(sbuf, sizeof(sbuf[0]), maxlen, fstr); | |
109 | for (p = list; ISVALID(p); p++) | |
110 | if (!strcmp(p->_name, sbuf)) { | |
111 | p->n_value = s->n_value; | |
112 | p->n_type = s->n_type; | |
113 | p->n_desc = s->n_desc; | |
114 | p->n_other = s->n_other; | |
115 | if (!--entries) | |
116 | goto done2; | |
117 | } | |
118 | } | |
119 | done2: (void)fclose(fstr); | |
120 | done1: (void)fclose(fsym); | |
121 | return(entries); | |
122 | } |