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92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
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/* Copyright (C) 1991 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 modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the GNU C Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <ansidecl.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 <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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DEFUN(nlist, (file, nl),
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CONST char *file AND 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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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((PTR) &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((PTR) symbols, sizeof(symbols[0]), nsymbols, f) != nsymbols)
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goto lose;
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if (fread((PTR) &string_table_size, sizeof(string_table_size), 1, f) != 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((PTR) 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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