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[/] [or1k/] [branches/] [newlib/] [newlib/] [newlib/] [libc/] [stdlib/] [setenv.c] - Rev 39
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/* This file may have been modified by DJ Delorie (Jan 1991). If so, ** these modifications are Coyright (C) 1991 DJ Delorie, 24 Kirsten Ave, ** Rochester NH, 03867-2954, USA. */ /* * 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 <stddef.h> #include <stdlib.h> #include <string.h> /* _findenv is defined in getenv.c. */ extern char *_findenv _PARAMS ((const char *, int *)); /* * setenv -- * Set the value of the environmental variable "name" to be * "value". If rewrite is set, replace any current value. */ int _DEFUN (setenv, (name, value, rewrite), _CONST char *name _AND _CONST char *value _AND int rewrite) { extern char **environ; static int alloced; /* if allocated space before */ register char *C; int l_value, offset; if (*value == '=') /* no `=' in value */ ++value; l_value = strlen (value); if ((C = _findenv (name, &offset))) { /* find if already exists */ if (!rewrite) return 0; if (strlen (C) >= l_value) { /* old larger; copy over */ while (*C++ = *value++); return 0; } } else { /* create new slot */ register int cnt; register char **P; for (P = environ, cnt = 0; *P; ++P, ++cnt); if (alloced) { /* just increase size */ environ = (char **) realloc ((char *) environ, (size_t) (sizeof (char *) * (cnt + 2))); if (!environ) return -1; } else { /* get new space */ alloced = 1; /* copy old entries into it */ P = (char **) malloc ((size_t) (sizeof (char *) * (cnt + 2))); if (!P) return (-1); bcopy ((char *) environ, (char *) P, cnt * sizeof (char *)); environ = P; } environ[cnt + 1] = NULL; offset = cnt; } for (C = (char *) name; *C && *C != '='; ++C); /* no `=' in name */ if (!(environ[offset] = /* name + `=' + value */ malloc ((size_t) ((int) (C - name) + l_value + 2)))) return -1; for (C = environ[offset]; (*C = *name++) && *C != '='; ++C); for (*C++ = '='; *C++ = *value++;); return 0; } /* * unsetenv(name) -- * Delete environmental variable "name". */ void _DEFUN (unsetenv, (name), _CONST char *name) { extern char **environ; register char **P; int offset; while (_findenv (name, &offset)) /* if set multiple times */ for (P = &environ[offset];; ++P) if (!(*P = *(P + 1))) break; }
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