Annotation of src/usr.bin/nm/nm.c, Revision 1.16
1.16 ! millert 1: /* $OpenBSD: nm.c,v 1.15 2001/11/19 19:02:15 mpech Exp $ */
1.2 deraadt 2: /* $NetBSD: nm.c,v 1.7 1996/01/14 23:04:03 pk Exp $ */
1.1 deraadt 3:
4: /*
5: * Copyright (c) 1989, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Hans Huebner.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
40: #ifndef lint
41: static char copyright[] =
42: "@(#) Copyright (c) 1989, 1993\n\
43: The Regents of the University of California. All rights reserved.\n";
44: #endif /* not lint */
45:
46: #ifndef lint
47: #if 0
48: static char sccsid[] = "@(#)nm.c 8.1 (Berkeley) 6/6/93";
49: #endif
1.16 ! millert 50: static char rcsid[] = "$OpenBSD: nm.c,v 1.15 2001/11/19 19:02:15 mpech Exp $";
1.1 deraadt 51: #endif /* not lint */
52:
1.5 deraadt 53: #include <sys/param.h>
1.1 deraadt 54: #include <sys/types.h>
55: #include <a.out.h>
56: #include <stab.h>
57: #include <ar.h>
58: #include <ranlib.h>
59: #include <unistd.h>
1.2 deraadt 60: #include <err.h>
1.1 deraadt 61: #include <ctype.h>
1.14 espie 62: #include <link.h>
1.1 deraadt 63: #include <stdio.h>
64: #include <stdlib.h>
65: #include <string.h>
1.8 espie 66: /* XXX get shared code to handle byte-order swaps */
67: #include "byte.c"
1.7 niklas 68:
1.1 deraadt 69:
1.10 espie 70: int demangle = 0;
1.1 deraadt 71: int ignore_bad_archive_entries = 1;
72: int print_only_external_symbols;
73: int print_only_undefined_symbols;
74: int print_all_symbols;
75: int print_file_each_line;
1.12 espie 76: int show_extensions = 0;
1.1 deraadt 77: int fcount;
78:
79: int rev;
1.16 ! millert 80: int fname(const void *, const void *);
! 81: int rname(const void *, const void *);
! 82: int value(const void *, const void *);
! 83: int (*sfunc)(const void *, const void *) = fname;
! 84: char *otherstring(struct nlist *);
! 85: char *typestring(unsigned int);
! 86: char typeletter(unsigned int);
1.1 deraadt 87:
1.8 espie 88:
1.1 deraadt 89: /* some macros for symbol type (nlist.n_type) handling */
90: #define IS_DEBUGGER_SYMBOL(x) ((x) & N_STAB)
91: #define IS_EXTERNAL(x) ((x) & N_EXT)
92: #define SYMBOL_TYPE(x) ((x) & (N_TYPE | N_STAB))
93:
1.16 ! millert 94: void *emalloc(size_t);
! 95: void pipe2cppfilt(void);
! 96: void usage(void);
! 97: char *symname(struct nlist *);
! 98: void print_symbol(const char *, struct nlist *);
1.10 espie 99:
1.1 deraadt 100: /*
101: * main()
102: * parse command line, execute process_file() for each file
103: * specified on the command line.
104: */
105: main(argc, argv)
106: int argc;
107: char **argv;
108: {
109: extern int optind;
110: int ch, errors;
111:
1.12 espie 112: while ((ch = getopt(argc, argv, "aBCegnopruw")) != -1) {
1.1 deraadt 113: switch (ch) {
114: case 'a':
115: print_all_symbols = 1;
116: break;
1.10 espie 117: case 'B':
118: /* no-op, compat with gnu-nm */
119: break;
120: case 'C':
121: demangle = 1;
122: break;
1.12 espie 123: case 'e':
124: show_extensions = 1;
125: break;
1.1 deraadt 126: case 'g':
127: print_only_external_symbols = 1;
128: break;
129: case 'n':
130: sfunc = value;
131: break;
132: case 'o':
133: print_file_each_line = 1;
134: break;
135: case 'p':
136: sfunc = NULL;
137: break;
138: case 'r':
139: rev = 1;
140: break;
141: case 'u':
142: print_only_undefined_symbols = 1;
143: break;
144: case 'w':
145: ignore_bad_archive_entries = 0;
146: break;
147: case '?':
148: default:
149: usage();
150: }
151: }
1.10 espie 152:
153: if (demangle)
154: pipe2cppfilt();
1.1 deraadt 155: fcount = argc - optind;
156: argv += optind;
157:
158: if (rev && sfunc == fname)
159: sfunc = rname;
160:
161: if (!fcount)
162: errors = process_file("a.out");
163: else {
164: errors = 0;
165: do {
166: errors |= process_file(*argv);
167: } while (*++argv);
168: }
169: exit(errors);
170: }
171:
172: /*
173: * process_file()
174: * show symbols in the file given as an argument. Accepts archive and
175: * object files as input.
176: */
177: process_file(fname)
178: char *fname;
179: {
180: struct exec exec_head;
181: FILE *fp;
182: int retval;
183: char magic[SARMAG];
184:
185: if (!(fp = fopen(fname, "r"))) {
1.6 deraadt 186: warn("cannot read %s", fname);
1.1 deraadt 187: return(1);
188: }
189:
190: if (fcount > 1)
191: (void)printf("\n%s:\n", fname);
192:
193: /*
194: * first check whether this is an object file - read a object
195: * header, and skip back to the beginning
196: */
197: if (fread((char *)&exec_head, sizeof(exec_head), (size_t)1, fp) != 1) {
1.2 deraadt 198: warnx("%s: bad format", fname);
1.1 deraadt 199: (void)fclose(fp);
200: return(1);
201: }
202: rewind(fp);
203:
1.8 espie 204: if (BAD_OBJECT(exec_head)) {
1.1 deraadt 205: /* this could be an archive */
206: if (fread(magic, sizeof(magic), (size_t)1, fp) != 1 ||
207: strncmp(magic, ARMAG, SARMAG)) {
1.2 deraadt 208: warnx("%s: not object file or archive", fname);
1.1 deraadt 209: (void)fclose(fp);
210: return(1);
211: }
212: retval = show_archive(fname, fp);
213: } else
214: retval = show_objfile(fname, fp);
215: (void)fclose(fp);
216: return(retval);
217: }
218:
219: /*
220: * show_archive()
221: * show symbols in the given archive file
222: */
223: show_archive(fname, fp)
224: char *fname;
225: FILE *fp;
226: {
227: struct ar_hdr ar_head;
228: struct exec exec_head;
229: int i, rval;
230: long last_ar_off;
231: char *p, *name;
232: int baselen, namelen;
233:
234: baselen = strlen(fname) + 3;
235: namelen = sizeof(ar_head.ar_name);
236: name = emalloc(baselen + namelen);
237:
238: rval = 0;
239:
240: /* while there are more entries in the archive */
241: while (fread((char *)&ar_head, sizeof(ar_head), (size_t)1, fp) == 1) {
242: /* bad archive entry - stop processing this archive */
243: if (strncmp(ar_head.ar_fmag, ARFMAG, sizeof(ar_head.ar_fmag))) {
1.2 deraadt 244: warnx("%s: bad format archive header", fname);
1.1 deraadt 245: (void)free(name);
246: return(1);
247: }
248:
249: /* remember start position of current archive object */
250: last_ar_off = ftell(fp);
251:
252: /* skip ranlib entries */
253: if (!strncmp(ar_head.ar_name, RANLIBMAG, sizeof(RANLIBMAG) - 1))
254: goto skip;
255:
256: /*
257: * construct a name of the form "archive.a:obj.o:" for the
258: * current archive entry if the object name is to be printed
259: * on each output line
260: */
261: p = name;
262: if (print_file_each_line)
263: p += sprintf(p, "%s:", fname);
264: #ifdef AR_EFMT1
265: /*
266: * BSD 4.4 extended AR format: #1/<namelen>, with name as the
267: * first <namelen> bytes of the file
268: */
269: if ( (ar_head.ar_name[0] == '#') &&
270: (ar_head.ar_name[1] == '1') &&
271: (ar_head.ar_name[2] == '/') &&
272: (isdigit(ar_head.ar_name[3]))) {
273:
274: int len = atoi(&ar_head.ar_name[3]);
275: if (len > namelen) {
276: p -= (long)name;
1.11 smart 277: if ((name = realloc(name, baselen+len)) == NULL)
278: err(1, NULL);
1.1 deraadt 279: namelen = len;
280: p += (long)name;
281: }
282: if (fread(p, len, 1, fp) != 1) {
1.2 deraadt 283: warnx("%s: premature EOF", name);
1.1 deraadt 284: (void)free(name);
285: return 1;
286: }
287: p += len;
288: } else
289: #endif
290: for (i = 0; i < sizeof(ar_head.ar_name); ++i)
291: if (ar_head.ar_name[i] && ar_head.ar_name[i] != ' ')
292: *p++ = ar_head.ar_name[i];
293: *p++ = '\0';
294:
295: /* get and check current object's header */
296: if (fread((char *)&exec_head, sizeof(exec_head),
297: (size_t)1, fp) != 1) {
1.2 deraadt 298: warnx("%s: premature EOF", name);
1.1 deraadt 299: (void)free(name);
300: return(1);
301: }
302:
1.8 espie 303: if (BAD_OBJECT(exec_head)) {
1.1 deraadt 304: if (!ignore_bad_archive_entries) {
1.2 deraadt 305: warnx("%s: bad format", name);
1.1 deraadt 306: rval = 1;
307: }
308: } else {
1.2 deraadt 309: (void)fseek(fp, (long)-sizeof(exec_head), SEEK_CUR);
1.1 deraadt 310: if (!print_file_each_line)
311: (void)printf("\n%s:\n", name);
312: rval |= show_objfile(name, fp);
313: }
314:
315: /*
316: * skip to next archive object - it starts at the next
317: * even byte boundary
318: */
319: #define even(x) (((x) + 1) & ~1)
320: skip: if (fseek(fp, last_ar_off + even(atol(ar_head.ar_size)),
321: SEEK_SET)) {
1.2 deraadt 322: warn("%s", fname);
1.1 deraadt 323: (void)free(name);
324: return(1);
325: }
326: }
327: (void)free(name);
328: return(rval);
329: }
330:
331: /*
332: * show_objfile()
333: * show symbols from the object file pointed to by fp. The current
334: * file pointer for fp is expected to be at the beginning of an a.out
335: * header.
336: */
337: show_objfile(objname, fp)
338: char *objname;
339: FILE *fp;
340: {
1.13 espie 341: struct nlist *names, *np;
342: struct nlist **snames;
1.15 mpech 343: int i, nnames, nrawnames;
1.1 deraadt 344: struct exec head;
345: long stabsize;
346: char *stab;
347:
348: /* read a.out header */
349: if (fread((char *)&head, sizeof(head), (size_t)1, fp) != 1) {
1.2 deraadt 350: warnx("%s: cannot read header", objname);
1.1 deraadt 351: return(1);
352: }
353:
354: /*
355: * skip back to the header - the N_-macros return values relative
356: * to the beginning of the a.out header
357: */
358: if (fseek(fp, (long)-sizeof(head), SEEK_CUR)) {
1.2 deraadt 359: warn("%s", objname);
1.1 deraadt 360: return(1);
361: }
362:
1.8 espie 363: /* stop if this is no valid object file, or a format we don't dare
364: * playing with
365: */
366: if (BAD_OBJECT(head)) {
1.2 deraadt 367: warnx("%s: bad format", objname);
1.1 deraadt 368: return(1);
369: }
370:
1.8 espie 371: fix_header_order(&head);
372:
1.1 deraadt 373: /* stop if the object file contains no symbol table */
374: if (!head.a_syms) {
1.2 deraadt 375: warnx("%s: no name list", objname);
1.1 deraadt 376: return(1);
377: }
378:
379: if (fseek(fp, (long)N_SYMOFF(head), SEEK_CUR)) {
1.2 deraadt 380: warn("%s", objname);
1.1 deraadt 381: return(1);
382: }
383:
384: /* get memory for the symbol table */
385: names = emalloc((size_t)head.a_syms);
386: nrawnames = head.a_syms / sizeof(*names);
1.13 espie 387: snames = emalloc(nrawnames*sizeof(struct nlist *));
1.1 deraadt 388: if (fread((char *)names, (size_t)head.a_syms, (size_t)1, fp) != 1) {
1.2 deraadt 389: warnx("%s: cannot read symbol table", objname);
1.1 deraadt 390: (void)free((char *)names);
391: return(1);
392: }
1.8 espie 393: fix_nlists_order(names, nrawnames, N_GETMID(head));
1.1 deraadt 394:
395: /*
396: * Following the symbol table comes the string table. The first
397: * 4-byte-integer gives the total size of the string table
398: * _including_ the size specification itself.
399: */
400: if (fread((char *)&stabsize, sizeof(stabsize), (size_t)1, fp) != 1) {
1.2 deraadt 401: warnx("%s: cannot read stab size", objname);
1.1 deraadt 402: (void)free((char *)names);
403: return(1);
404: }
1.8 espie 405: stabsize = fix_long_order(stabsize, N_GETMID(head));
1.1 deraadt 406: stab = emalloc((size_t)stabsize);
407:
408: /*
409: * read the string table offset by 4 - all indices into the string
410: * table include the size specification.
411: */
412: stabsize -= 4; /* we already have the size */
413: if (fread(stab + 4, (size_t)stabsize, (size_t)1, fp) != 1) {
1.2 deraadt 414: warnx("%s: stab truncated..", objname);
1.1 deraadt 415: (void)free((char *)names);
416: (void)free(stab);
417: return(1);
418: }
419:
420: /*
421: * fix up the symbol table and filter out unwanted entries
422: *
423: * common symbols are characterized by a n_type of N_UNDF and a
424: * non-zero n_value -- change n_type to N_COMM for all such
425: * symbols to make life easier later.
426: *
427: * filter out all entries which we don't want to print anyway
428: */
429: for (np = names, i = nnames = 0; i < nrawnames; np++, i++) {
1.13 espie 430: /*
431: * make n_un.n_name a character pointer by adding the string
432: * table's base to n_un.n_strx
433: *
434: * don't mess with zero offsets
435: */
436: if (np->n_un.n_strx)
437: np->n_un.n_name = stab + np->n_un.n_strx;
438: else
439: np->n_un.n_name = "";
1.1 deraadt 440: if (SYMBOL_TYPE(np->n_type) == N_UNDF && np->n_value)
441: np->n_type = N_COMM | (np->n_type & N_EXT);
442: if (!print_all_symbols && IS_DEBUGGER_SYMBOL(np->n_type))
443: continue;
444: if (print_only_external_symbols && !IS_EXTERNAL(np->n_type))
445: continue;
446: if (print_only_undefined_symbols &&
447: SYMBOL_TYPE(np->n_type) != N_UNDF)
448: continue;
449:
1.13 espie 450: snames[nnames++] = np;
1.1 deraadt 451: }
452:
453: /* sort the symbol table if applicable */
454: if (sfunc)
1.13 espie 455: qsort(snames, (size_t)nnames, sizeof(*snames), sfunc);
1.1 deraadt 456:
457: /* print out symbols */
1.13 espie 458: for (i = 0; i < nnames; i++) {
459: if (show_extensions && snames[i] != names &&
460: SYMBOL_TYPE((snames[i] -1)->n_type) == N_INDR)
461: continue;
462: print_symbol(objname, snames[i]);
463: }
1.1 deraadt 464:
1.13 espie 465: (void)free(snames);
466: (void)free(names);
1.1 deraadt 467: (void)free(stab);
468: return(0);
469: }
470:
1.13 espie 471: char *
472: symname(sym)
473: struct nlist *sym;
474: {
475: if (demangle && sym->n_un.n_name[0] == '_')
476: return sym->n_un.n_name + 1;
477: else
478: return sym->n_un.n_name;
479: }
480:
1.1 deraadt 481: /*
482: * print_symbol()
483: * show one symbol
484: */
1.13 espie 485: void
1.1 deraadt 486: print_symbol(objname, sym)
1.13 espie 487: const char *objname;
488: struct nlist *sym;
1.1 deraadt 489: {
490: if (print_file_each_line)
491: (void)printf("%s:", objname);
492:
493: /*
1.10 espie 494: * handle undefined-only format especially (no space is
1.1 deraadt 495: * left for symbol values, no type field is printed)
496: */
1.10 espie 497: if (!print_only_undefined_symbols) {
498: /* print symbol's value */
1.13 espie 499: if (SYMBOL_TYPE(sym->n_type) == N_UNDF ||
500: (show_extensions && SYMBOL_TYPE(sym->n_type) == N_INDR &&
501: sym->n_value == 0))
1.10 espie 502: (void)printf(" ");
503: else
504: (void)printf("%08lx", sym->n_value);
505:
506: /* print type information */
507: if (IS_DEBUGGER_SYMBOL(sym->n_type))
508: (void)printf(" - %02x %04x %5s ", sym->n_other,
509: sym->n_desc&0xffff, typestring(sym->n_type));
1.12 espie 510: else if (show_extensions)
511: (void)printf(" %c%2s ", typeletter(sym->n_type),
1.14 espie 512: otherstring(sym));
1.10 espie 513: else
514: (void)printf(" %c ", typeletter(sym->n_type));
1.1 deraadt 515: }
516:
1.13 espie 517: if (SYMBOL_TYPE(sym->n_type) == N_INDR && show_extensions) {
518: printf("%s -> %s\n", symname(sym), symname(sym+1));
519: }
1.1 deraadt 520: else
1.13 espie 521: (void)puts(symname(sym));
1.12 espie 522: }
523:
524: char *
1.14 espie 525: otherstring(sym)
526: struct nlist *sym;
1.12 espie 527: {
528: static char buf[3];
529: char *result;
530:
531: result = buf;
532:
1.14 espie 533: if (N_BIND(sym) == BIND_WEAK)
1.12 espie 534: *result++ = 'w';
1.14 espie 535: if (N_AUX(sym) == AUX_OBJECT)
1.12 espie 536: *result++ = 'o';
1.14 espie 537: else if (N_AUX(sym) == AUX_FUNC)
1.12 espie 538: *result++ = 'f';
539: *result++ = 0;
540: return buf;
1.1 deraadt 541: }
542:
543: /*
544: * typestring()
545: * return the a description string for an STAB entry
546: */
547: char *
548: typestring(type)
1.14 espie 549: unsigned int type;
1.1 deraadt 550: {
551: switch(type) {
552: case N_BCOMM:
553: return("BCOMM");
554: case N_ECOML:
555: return("ECOML");
556: case N_ECOMM:
557: return("ECOMM");
558: case N_ENTRY:
559: return("ENTRY");
560: case N_FNAME:
561: return("FNAME");
562: case N_FUN:
563: return("FUN");
564: case N_GSYM:
565: return("GSYM");
566: case N_LBRAC:
567: return("LBRAC");
568: case N_LCSYM:
569: return("LCSYM");
570: case N_LENG:
571: return("LENG");
572: case N_LSYM:
573: return("LSYM");
574: case N_PC:
575: return("PC");
576: case N_PSYM:
577: return("PSYM");
578: case N_RBRAC:
579: return("RBRAC");
580: case N_RSYM:
581: return("RSYM");
582: case N_SLINE:
583: return("SLINE");
584: case N_SO:
585: return("SO");
586: case N_SOL:
587: return("SOL");
588: case N_SSYM:
589: return("SSYM");
590: case N_STSYM:
591: return("STSYM");
592: }
593: return("???");
594: }
595:
596: /*
597: * typeletter()
598: * return a description letter for the given basic type code of an
599: * symbol table entry. The return value will be upper case for
600: * external, lower case for internal symbols.
601: */
602: char
603: typeletter(type)
1.14 espie 604: unsigned int type;
1.1 deraadt 605: {
606: switch(SYMBOL_TYPE(type)) {
607: case N_ABS:
608: return(IS_EXTERNAL(type) ? 'A' : 'a');
609: case N_BSS:
610: return(IS_EXTERNAL(type) ? 'B' : 'b');
611: case N_COMM:
612: return(IS_EXTERNAL(type) ? 'C' : 'c');
613: case N_DATA:
614: return(IS_EXTERNAL(type) ? 'D' : 'd');
615: case N_FN:
616: /* NOTE: N_FN == N_WARNING,
617: * in this case, the N_EXT bit is to considered as
618: * part of the symbol's type itself.
619: */
620: return(IS_EXTERNAL(type) ? 'F' : 'W');
621: case N_TEXT:
622: return(IS_EXTERNAL(type) ? 'T' : 't');
623: case N_INDR:
624: return(IS_EXTERNAL(type) ? 'I' : 'i');
625: case N_SIZE:
626: return(IS_EXTERNAL(type) ? 'S' : 's');
627: case N_UNDF:
628: return(IS_EXTERNAL(type) ? 'U' : 'u');
629: }
630: return('?');
631: }
632:
1.13 espie 633: int
1.1 deraadt 634: fname(a0, b0)
1.13 espie 635: const void *a0, *b0;
1.1 deraadt 636: {
1.13 espie 637: struct nlist * const *a = a0, * const *b = b0;
1.1 deraadt 638:
1.13 espie 639: return(strcmp((*a)->n_un.n_name, (*b)->n_un.n_name));
1.1 deraadt 640: }
641:
1.13 espie 642: int
1.1 deraadt 643: rname(a0, b0)
1.13 espie 644: const void *a0, *b0;
1.1 deraadt 645: {
1.13 espie 646: struct nlist * const *a = a0, * const *b = b0;
1.1 deraadt 647:
1.13 espie 648: return(strcmp((*b)->n_un.n_name, (*a)->n_un.n_name));
1.1 deraadt 649: }
650:
1.13 espie 651: int
1.1 deraadt 652: value(a0, b0)
1.13 espie 653: const void *a0, *b0;
1.1 deraadt 654: {
1.13 espie 655: struct nlist * const *a = a0, * const *b = b0;
1.1 deraadt 656:
1.13 espie 657: if (SYMBOL_TYPE((*a)->n_type) == N_UNDF)
658: if (SYMBOL_TYPE((*b)->n_type) == N_UNDF)
1.1 deraadt 659: return(0);
660: else
661: return(-1);
1.13 espie 662: else if (SYMBOL_TYPE((*b)->n_type) == N_UNDF)
1.1 deraadt 663: return(1);
664: if (rev) {
1.13 espie 665: if ((*a)->n_value == (*b)->n_value)
1.1 deraadt 666: return(rname(a0, b0));
1.13 espie 667: return((*b)->n_value > (*a)->n_value ? 1 : -1);
1.1 deraadt 668: } else {
1.13 espie 669: if ((*a)->n_value == (*b)->n_value)
1.1 deraadt 670: return(fname(a0, b0));
1.13 espie 671: return((*a)->n_value > (*b)->n_value ? 1 : -1);
1.1 deraadt 672: }
673: }
674:
675: void *
676: emalloc(size)
677: size_t size;
678: {
679: char *p;
680:
681: /* NOSTRICT */
682: if (p = malloc(size))
683: return(p);
1.2 deraadt 684: err(1, NULL);
1.1 deraadt 685: }
686:
1.10 espie 687: #define CPPFILT "/usr/bin/c++filt"
688:
689: void
690: pipe2cppfilt()
691: {
692: int pip[2];
693: char *argv[2];
694:
695: argv[0] = "c++filt";
696: argv[1] = NULL;
697:
698: if (pipe(pip) == -1)
699: err(1, "pipe");
700: switch(fork()) {
701: case -1:
702: err(1, "fork");
703: default:
704: dup2(pip[0], 0);
705: close(pip[0]);
706: close(pip[1]);
707: execve(CPPFILT, argv, NULL);
708: err(1, "execve");
709: case 0:
710: dup2(pip[1], 1);
711: close(pip[1]);
712: close(pip[0]);
713: }
714: }
715:
1.11 smart 716: void
1.1 deraadt 717: usage()
718: {
1.10 espie 719: (void)fprintf(stderr, "usage: nm [-aCgnopruw] [file ...]\n");
1.1 deraadt 720: exit(1);
721: }
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