92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/* Copyright (C) 1991, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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 <stdlib.h>
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#include <string.h>
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/* Search the executable FILE for symbols matching those in NL,
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which is terminated by an element with a NULL `n_un.n_name' member,
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and fill in the elements of NL. */
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int
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nlist (const char *file, struct nlist *nl)
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{
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FILE *f;
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struct exec header;
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size_t nsymbols;
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struct nlist *symbols;
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unsigned long int string_table_size;
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char *string_table;
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register size_t i;
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if (nl == NULL)
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{
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__set_errno (EINVAL);
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return -1;
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}
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f = fopen (file, "r");
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if (f == NULL)
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return -1;
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if (fread ((void *) &header, sizeof (header), 1, f) != 1)
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goto lose;
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if (fseek (f, N_SYMOFF (header), SEEK_SET) != 0)
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goto lose;
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symbols = (struct nlist *) __alloca (header.a_syms);
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nsymbols = header.a_syms / sizeof (symbols[0]);
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if (fread ((void *) symbols, sizeof (symbols[0]), nsymbols, f) != nsymbols)
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goto lose;
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if (fread ((void *) &string_table_size, sizeof (string_table_size), 1, f)
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!= 1)
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goto lose;
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string_table_size -= sizeof (string_table_size);
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string_table = (char *) __alloca (string_table_size);
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if (fread ((void *) string_table, string_table_size, 1, f) != 1)
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goto lose;
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for (i = 0; i < nsymbols; ++i)
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{
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register struct nlist *nlp;
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for (nlp = nl; nlp->n_un.n_name != NULL; ++nlp)
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if (!strcmp (nlp->n_un.n_name,
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&string_table[symbols[i].n_un.n_strx -
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sizeof (string_table_size)]))
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{
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char *const name = nlp->n_un.n_name;
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*nlp = symbols[i];
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nlp->n_un.n_name = name;
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}
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}
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(void) fclose (f);
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return 0;
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lose:;
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(void) fclose (f);
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return -1;
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}
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