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Line 24... |
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#include <stddef.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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/* _findenv is defined in getenv.c. */
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extern void unsetenv_r _PARAMS ((struct _reent *, const char *));
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extern char *_findenv _PARAMS ((const char *, int *));
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/*
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/*
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* setenv --
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* setenv --
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* Set the value of the environmental variable "name" to be
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* Set the value of the environmental variable "name" to be
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* "value". If rewrite is set, replace any current value.
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* "value". If rewrite is set, replace any current value.
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Line 38... |
_DEFUN (setenv, (name, value, rewrite),
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_DEFUN (setenv, (name, value, rewrite),
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_CONST char *name _AND
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_CONST char *name _AND
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_CONST char *value _AND
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_CONST char *value _AND
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int rewrite)
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int rewrite)
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{
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{
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extern char **environ;
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return _setenv_r (_REENT, name, value, rewrite);
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static int alloced; /* if allocated space before */
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register char *C;
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int l_value, offset;
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if (*value == '=') /* no `=' in value */
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++value;
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l_value = strlen (value);
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if ((C = _findenv (name, &offset)))
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{ /* find if already exists */
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if (!rewrite)
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return 0;
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if (strlen (C) >= l_value)
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{ /* old larger; copy over */
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while (*C++ = *value++);
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return 0;
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}
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}
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else
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{ /* create new slot */
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register int cnt;
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register char **P;
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for (P = environ, cnt = 0; *P; ++P, ++cnt);
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if (alloced)
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{ /* just increase size */
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environ = (char **) realloc ((char *) environ,
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(size_t) (sizeof (char *) * (cnt + 2)));
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if (!environ)
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return -1;
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}
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else
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{ /* get new space */
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alloced = 1; /* copy old entries into it */
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P = (char **) malloc ((size_t) (sizeof (char *) * (cnt + 2)));
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if (!P)
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return (-1);
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bcopy ((char *) environ, (char *) P, cnt * sizeof (char *));
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environ = P;
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}
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environ[cnt + 1] = NULL;
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offset = cnt;
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}
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for (C = (char *) name; *C && *C != '='; ++C); /* no `=' in name */
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if (!(environ[offset] = /* name + `=' + value */
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malloc ((size_t) ((int) (C - name) + l_value + 2))))
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return -1;
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for (C = environ[offset]; (*C = *name++) && *C != '='; ++C);
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for (*C++ = '='; *C++ = *value++;);
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return 0;
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}
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}
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/*
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/*
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* unsetenv(name) --
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* unsetenv(name) --
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* Delete environmental variable "name".
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* Delete environmental variable "name".
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*/
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*/
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void
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void
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_DEFUN (unsetenv, (name),
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_DEFUN (unsetenv, (name),
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_CONST char *name)
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_CONST char *name)
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{
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{
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extern char **environ;
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unsetenv_r (_REENT, name);
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register char **P;
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int offset;
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while (_findenv (name, &offset)) /* if set multiple times */
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for (P = &environ[offset];; ++P)
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if (!(*P = *(P + 1)))
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break;
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}
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}
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No newline at end of file
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No newline at end of file
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