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putenv.c
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/*!
\file lib/gis/putenv.c
\brief GIS library - environment routines
(C) 2001-2009, 2011 by the GRASS Development Team
This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.
\author Original author CERL
\author Updated for GRASS7 by Glynn Clements
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <grass/config.h>
#include <grass/gis.h>
#if !defined(HAVE_PUTENV) && !defined(HAVE_SETENV)
extern char **environ;
#endif
/*!
\brief Sets the UNIX environment variable name to value
\param name env name
\param value env value
*/
void G_putenv(const char *name, const char *value)
{
char buf[1024];
#if defined(HAVE_PUTENV)
snprintf(buf, sizeof(buf), "%s=%s", name, value);
putenv(G_store(buf));
#elif defined(HAVE_SETENV)
setenv(name, value, 1);
#else
static int first = 1;
int i;
char **newenv;
char *env;
if (first) {
for (i = 0; environ[i]; i++)
;
newenv = (char **)G_malloc((i + 1) * sizeof(char *));
for (i = 0; env = environ[i], env; i++)
newenv[i] = G_store(env);
newenv[i] = NULL;
environ = newenv;
first = 0;
}
for (i = 0; env = environ[i], env; i++) {
char temp[4];
if (sscanf(env, "%[^=]=%1s", buf, temp) < 1)
continue;
if (strcmp(buf, name) != 0)
continue;
G_free(env);
snprintf(buf, sizeof(buf), "%s=%s", name, value);
environ[i] = G_store(buf);
return;
}
environ = (char **)G_realloc(environ, (i + 2) * sizeof(char *));
snprintf(buf, sizeof(buf), "%s=%s", name, value);
environ[i++] = G_store(buf);
environ[i] = NULL;
#endif
}
G_free
void G_free(void *buf)
Free allocated memory.
Definition alloc.c:147
NULL
#define NULL
Definition ccmath.h:32
name
const char * name
Definition named_colr.c:6
G_putenv
void G_putenv(const char *name, const char *value)
Sets the UNIX environment variable name to value.
Definition putenv.c:31
environ
char ** environ
G_store
char * G_store(const char *s)
Copy string to allocated memory.
Definition strings.c:87