X-Git-Url: http://git.madism.org/?p=apps%2Fmadmutt.git;a=blobdiff_plain;f=setenv.c;fp=setenv.c;h=6dd6c938faa4690362af05837513ad3777cd6ceb;hp=0000000000000000000000000000000000000000;hb=c8becc4d099cee8c18ebd967720ce7204311d817;hpb=d2facf5ade8ae6d0831a2b8496b2c1017a935172

diff --git a/setenv.c b/setenv.c
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+++ b/setenv.c
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+/*  $Id$
+**
+**  Replacement for a missing setenv.
+**
+**  Written by Russ Allbery <rra@stanford.edu>
+**  This work is hereby placed in the public domain by its author.
+**
+**  Provides the same functionality as the standard library routine setenv
+**  for those platforms that don't have it.
+*/
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+int
+setenv(const char *name, const char *value, int overwrite)
+{
+    char *envstring;
+
+    if (!overwrite && getenv(name) != NULL)
+        return 0;
+
+    /* Allocate memory for the environment string.  We intentionally don't
+       use concat here, or the xmalloc family of allocation routines, since
+       the intention is to provide a replacement for the standard library
+       function which sets errno and returns in the event of a memory
+       allocation failure. */
+    envstring = malloc(strlen(name) + 1 + strlen(value) + 1); /* __MEM_CHECKED__ */
+    if (envstring == NULL)
+        return -1;
+
+    /* Build the environment string and add it to the environment using
+       putenv.  Systems without putenv lose, but XPG4 requires it. */
+    strcpy(envstring, name);  /* __STRCPY_CHECKED__ */
+    strcat(envstring, "=");   /* __STRCAT_CHECKED__ */
+    strcat(envstring, value); /* __STRCAT_CHECKED__ */
+    return putenv(envstring);
+
+    /* Note that the memory allocated is not freed.  This is intentional;
+       many implementations of putenv assume that the string passed to
+       putenv will never be freed and don't make a copy of it.  Repeated use
+       of this function will therefore leak memory, since most
+       implementations of putenv also don't free strings removed from the
+       environment (due to being overwritten). */
+}