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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [stdlib/] [setenv_r.c] - Rev 148
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/* This file may have been modified by DJ Delorie (Jan 1991). If so, ** these modifications are Copyright (C) 1991 DJ Delorie. */ /* * Copyright (c) 1987 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that: (1) source distributions retain this entire copyright * notice and comment, and (2) distributions including binaries display * the following acknowledgement: ``This product includes software * developed by the University of California, Berkeley and its contributors'' * in the documentation or other materials provided with the distribution * and in all advertising materials mentioning features or use of this * software. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #include <reent.h> #include <stddef.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <errno.h> #include "envlock.h" extern char **environ; /* Only deal with a pointer to environ, to work around subtle bugs with shared libraries and/or small data systems where the user declares his own 'environ'. */ static char ***p_environ = &environ; /* _findenv_r is defined in getenv_r.c. */ extern char *_findenv_r _PARAMS ((struct _reent *, const char *, int *)); /* * _setenv_r -- * Set the value of the environmental variable "name" to be * "value". If rewrite is set, replace any current value. * If "name" contains equal sign, -1 is returned, and errno is * set to EINVAL; */ int _DEFUN (_setenv_r, (reent_ptr, name, value, rewrite), struct _reent *reent_ptr _AND _CONST char *name _AND _CONST char *value _AND int rewrite) { static int alloced; /* if allocated space before */ register char *C; int l_value, offset; if (strchr(name, '=')) { errno = EINVAL; return -1; } ENV_LOCK; l_value = strlen (value); if ((C = _findenv_r (reent_ptr, name, &offset))) { /* find if already exists */ if (!rewrite) { ENV_UNLOCK; return 0; } if (strlen (C) >= l_value) { /* old larger; copy over */ while ((*C++ = *value++) != 0); ENV_UNLOCK; /* if we are changing the TZ environment variable, update timezone info */ if (strcmp (name, "TZ") == 0) tzset (); return 0; } } else { /* create new slot */ register int cnt; register char **P; for (P = *p_environ, cnt = 0; *P; ++P, ++cnt); if (alloced) { /* just increase size */ *p_environ = (char **) _realloc_r (reent_ptr, (char *) environ, (size_t) (sizeof (char *) * (cnt + 2))); if (!*p_environ) { ENV_UNLOCK; return -1; } } else { /* get new space */ alloced = 1; /* copy old entries into it */ P = (char **) _malloc_r (reent_ptr, (size_t) (sizeof (char *) * (cnt + 2))); if (!P) { ENV_UNLOCK; return (-1); } bcopy ((char *) *p_environ, (char *) P, cnt * sizeof (char *)); *p_environ = P; } (*p_environ)[cnt + 1] = NULL; offset = cnt; } for (C = (char *) name; *C && *C != '='; ++C); /* no `=' in name */ if (!((*p_environ)[offset] = /* name + `=' + value */ _malloc_r (reent_ptr, (size_t) ((int) (C - name) + l_value + 2)))) { ENV_UNLOCK; return -1; } for (C = (*p_environ)[offset]; (*C = *name++) && *C != '='; ++C); for (*C++ = '='; (*C++ = *value++) != 0;); ENV_UNLOCK; /* if we are setting the TZ environment variable, update timezone info */ if (strncmp ((*p_environ)[offset], "TZ=", 3) == 0) tzset (); return 0; } /* * _unsetenv_r(name) -- * Delete environmental variable "name". */ int _DEFUN (_unsetenv_r, (reent_ptr, name), struct _reent *reent_ptr _AND _CONST char *name) { register char **P; int offset; /* Name cannot be NULL, empty, or contain an equal sign. */ if (name == NULL || name[0] == '\0' || strchr(name, '=')) { errno = EINVAL; return -1; } ENV_LOCK; while (_findenv_r (reent_ptr, name, &offset)) /* if set multiple times */ { for (P = &(*p_environ)[offset];; ++P) if (!(*P = *(P + 1))) break; } ENV_UNLOCK; return 0; }
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