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379d4ec497
2002-02-02 Ulrich Drepper <drepper@redhat.com> * sysdeps/generic/dl-environ.c (unsetenv): Optimize. Don't use strncmp. * elf/dl-load.c (is_dst): Optimize. Don't call strncmp twice. * elf/rtld.c (process_dl_debug): Optimize. Avoid calls to strncmp, strspn, and strcspn. (process_envvars): Don't use strcspn. * elf/dl-load.c (_dl_dst_count): Fix possible endless loop. (_dl_dst_substitute): Likewise.
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/* Environment handling for dynamic loader.
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Copyright (C) 1995-1998, 2000, 2001, 2002 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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/* Walk through the environment of the process and return all entries
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starting with `LD_'. */
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char *
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internal_function
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_dl_next_ld_env_entry (char ***position)
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{
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char **current = *position;
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char *result = NULL;
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while (*current != NULL)
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{
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if (__builtin_expect ((*current)[0] == 'L', 0)
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&& (*current)[1] == 'D' && (*current)[2] == '_')
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{
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result = &(*current)[3];
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/* Save current position for next visit. */
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*position = ++current;
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break;
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}
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++current;
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}
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return result;
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}
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int
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unsetenv (const char *name)
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{
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char **ep;
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ep = __environ;
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while (*ep != NULL)
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{
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size_t cnt;
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while ((*ep)[cnt] == name[cnt] && name[cnt] != '\0')
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++cnt;
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if ((*ep)[cnt] == '=')
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{
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/* Found it. Remove this pointer by moving later ones to
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the front. */
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char **dp = ep;
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do
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dp[0] = dp[1];
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while (*dp++);
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/* Continue the loop in case NAME appears again. */
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}
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else
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++ep;
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}
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return 0;
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}
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