1 files changed, 73 insertions, 0 deletions
diff --git a/missing/setenv.c b/missing/setenv.c
new file mode 100644
index 0000000000..6211bcf02b
--- /dev/null
+++ b/missing/setenv.c
@@ -0,0 +1,73 @@
+/* 
+ *    Copyright (c) 1991, Larry Wall
+ *
+ *    You may distribute under the terms of either the GNU General Public
+ *    License or the Artistic License, as specified in the README file.
+ */
+
+#include "ruby.h"
+
+extern char **environ;
+extern char **origenviron;
+
+char *strdup();
+
+int
+envix(nam)
+char *nam;
+{
+    register int i, len = strlen(nam);
+
+    for (i = 0; environ[i]; i++) {
+	if (memcmp(environ[i],nam,len) && environ[i][len] == '=')
+	    break;			/* strnEQ must come first to avoid */
+    }					/* potential SEGV's */
+    return i;
+}
+
+void
+setenv(nam,val)
+char *nam, *val;
+{
+    register int i=envix(nam);		/* where does it go? */
+
+    if (environ == origenviron) {	/* need we copy environment? */
+	int j;
+	int max;
+	char **tmpenv;
+
+	/*SUPPRESS 530*/
+	for (max = i; environ[max]; max++) ;
+	tmpenv = ALLOC_N(char*, max+2);
+	for (j=0; j<max; j++)		/* copy environment */
+	    tmpenv[j] = strdup(environ[j]);
+	tmpenv[max] = 0;
+	environ = tmpenv;		/* tell exec where it is now */
+    }
+    if (!val) {
+	while (environ[i]) {
+	    environ[i] = environ[i+1];
+	    i++;
+	}
+	return;
+    }
+    if (!environ[i]) {			/* does not exist yet */
+	REALLOC_N(environ, char*, i+2);	/* just expand it a bit */
+	environ[i+1] = 0;	/* make sure it's null terminated */
+    }
+    else {
+	free(environ[i]);
+    }
+    environ[i] = ALLOC_N(char, strlen(nam) + strlen(val) + 2);
+#ifndef MSDOS
+    (void)sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */
+#else
+    /* MS-DOS requires environment variable names to be in uppercase */
+    /* [Tom Dinger, 27 August 1990: Well, it doesn't _require_ it, but
+     * some utilities and applications may break because they only look
+     * for upper case strings. (Fixed strupr() bug here.)]
+     */
+    strcpy(environ[i],nam); strupr(environ[i]);
+    (void)sprintf(environ[i] + strlen(nam),"=%s",val);
+#endif /* MSDOS */
+}