Add more compat code for non GNU environments

Signed-off-by: Dan Fandrich <dan@coneharvesters.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 59 insertions, 8 deletions

diff --git a/libbb/platform.c b/libbb/platform.c
index 470185a68..fdd388259 100644
--- a/libbb/platform.c
+++ b/libbb/platform.c
@@ -6,13 +6,13 @@
  *
  * Licensed under the GPL version 2, see the file LICENSE in this tarball.
  */
-
 #include "libbb.h"
 
 #ifndef HAVE_STRCHRNUL
-char * FAST_FUNC strchrnul(const char *s, int c)
+char* FAST_FUNC strchrnul(const char *s, int c)
 {
-	while (*s && *s != c) ++s;
+	while (*s != '\0' && *s != c)
+		s++;
 	return (char*)s;
 }
 #endif
@@ -22,15 +22,19 @@ int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
 {
 	int r;
 	va_list p2;
+	char buf[128];
 
 	va_copy(p2, p);
-	r = vsnprintf(NULL, 0, format, p);
+	r = vsnprintf(buf, 128, format, p);
 	va_end(p);
+
+	if (r < 128) {
+		va_end(p2);
+		return xstrdup(buf);
+	}
+
 	*string_ptr = xmalloc(r+1);
-	if (!*string_ptr)
-		r = -1;
-	else
-		r = vsnprintf(*string_ptr, r+1, format, p2);
+	r = vsnprintf(*string_ptr, r+1, format, p2);
 	va_end(p2);
 
 	return r;
@@ -38,6 +42,7 @@ int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
 #endif
 
 #ifndef HAVE_FDPRINTF
+/* dprintf is now actually part of POSIX.1, but was only added in 2008 */
 int fdprintf(int fd, const char *format, ...)
 {
 	va_list p;
@@ -55,3 +60,49 @@ int fdprintf(int fd, const char *format, ...)
 }
 #endif
 
+#ifndef HAVE_MEMRCHR
+/* Copyright (C) 2005 Free Software Foundation, Inc.
+ * memrchr() is a GNU function that might not be available everywhere.
+ * It's basically the inverse of memchr() - search backwards in a
+ * memory block for a particular character.
+ */
+void* FAST_FUNC memrchr(const void *s, int c, size_t n)
+{
+	const char *start = s, *end = s;
+
+	end += n - 1;
+
+	while (end >= start) {
+		if (*end == (char)c)
+			return (void *) end;
+		end--;
+	}
+
+	return NULL;
+}
+#endif
+
+#ifndef HAVE_MKDTEMP
+/* This is now actually part of POSIX.1, but was only added in 2008 */
+char* FAST_FUNC mkdtemp(char *template)
+{
+	if (mktemp(template) == NULL || mkdir(template, 0700) != 0)
+		return NULL;
+	return template;
+}
+#endif
+
+#ifndef HAVE_STRCASESTR
+/* Copyright (c) 1999, 2000 The ht://Dig Group */
+char* FAST_FUNC strcasestr(const char *s, const char *pattern)
+{
+	int length = strlen(pattern);
+
+	while (*s) {
+		if (strncasecmp(s, pattern, length) == 0)
+			return (char *)s;
+		s++;
+	}
+	return 0;
+}
+#endif