Initial revision

1 files changed, 151 insertions, 0 deletions

diff --git a/env.c b/env.c
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index 0000000..5d4e567
--- /dev/null
+++ b/env.c
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+/*
+ * Provide setenv() and unsetenv() on platforms that don't have them.
+ * From FreeBSD's libc.
+ */
+
+/*
+ * Copyright (c) 1987, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* $XFree86: xc/programs/fonttosfnt/env.c,v 1.1 2003/07/08 15:39:49 tsi Exp $ */
+
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+
+extern char **environ;
+
+extern int setenv(const char *name, const char *value, int overwrite);
+extern void unsetenv(const char *name);
+
+static char *
+findenv(const char *name, int *offset)
+{
+    int len, i;
+    const char *np;
+    char **p, *cp;
+
+    if (name == NULL || environ == NULL)
+	return NULL;
+
+    for (np = name; *np && *np != '='; ++np)
+	continue;
+    len = np - name;
+    for (p = environ; (cp = *p) != NULL; ++p) {
+	for (np = name, i = len; i && *cp; i--)
+	    if (*cp++ != *np++)
+		break;
+	if (i == 0 && *cp++ == '=') {
+	    *offset = p - environ;
+	    return cp;
+	}
+    }
+    return NULL;
+}
+
+/*
+ * setenv --
+ *      Set the value of the environmental variable "name" to be
+ *      "value".  If overwrite is set, replace any current value.
+ */
+
+int
+setenv(const char *name, const char *value, int overwrite)
+{
+    static char **alloced;			/* if allocated space before */
+    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 (!overwrite)
+	    return 0;
+	if (strlen(c) >= l_value) {		/* old larger; copy over */
+	    while ((*c++ = *value++))
+		;
+	    return 0;
+	}
+    } else {					/* create new slot */
+	int cnt;
+	char **p;
+
+	for (p = environ, cnt = 0; *p; ++p, ++cnt)
+	    ;
+	if (alloced == environ) {		/* just increase size */
+	    p = (char **)realloc((char *)environ,
+				 sizeof(char *) * (cnt + 2));
+	    if (!p)
+		return -1;
+	    alloced = environ = p;
+	} else {				/* get new space */
+						/* copy old entries into it */
+	    p = malloc(sizeof(char *) * (cnt + 2));
+	    if (!p)
+		return -1;
+	    memcpy(p, environ, cnt * sizeof(char *));
+	    alloced = environ = p;
+	}
+	environ[cnt + 1] = NULL;
+	offset = cnt;
+    }
+    for (c = (char *)name; *c && *c != '='; ++c)	/* no '=' in name */
+	;
+    if (!(environ[offset] =				/* name + '=' + value */
+			malloc((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
+unsetenv(const char *name)
+{
+    char **p;
+    int offset;
+
+    while (findenv(name, &offset))		/* if set multiple times */
+	for (p = &environ[offset];; ++p)
+	    if (!(*p = *(p + 1)))
+		break;
+}
+