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>

TODO

@@ -6,11 +6,8 @@ do one of these bounce an email off the person it's listed under to see if they
 have any suggestions how they plan to go about it, and to minimize conflicts
 between your work and theirs.  But otherwise, all of these are fair game.
 
-Rob Landley suggested these:
-  Add a libbb/platform.c
-    Implement fdprintf() for platforms that haven't got one.
-    Implement bb_realpath() that can handle NULL on non-glibc.
-    Cleanup bb_asprintf()
+Rob Landley suggested this:
+  Implement bb_realpath() that can handle NULL on non-glibc.
 
   Remove obsolete _() wrapper crud for internationalization we don't do.
   Figure out where we need utf8 support, and add it.

include/platform.h

@@ -11,7 +11,12 @@
  * true will #undef them below.
  */
 #define HAVE_FDPRINTF 1
+#define HAVE_MEMRCHR 1
+#define HAVE_MKDTEMP 1
+#define HAVE_SETBIT 1
+#define HAVE_STRCASESTR 1
 #define HAVE_STRCHRNUL 1
+#define HAVE_STRSIGNAL 1
 #define HAVE_VASPRINTF 1
 
 /* Convenience macros to test the version of gcc. */
@@ -335,17 +340,22 @@ typedef unsigned smalluint;
 #endif
 
 #if defined(__dietlibc__)
-#undef HAVE_STRCHRNUL
+# undef HAVE_STRCHRNUL
 #endif
 
 #if defined(__WATCOMC__)
-#undef HAVE_FDPRINTF
-#undef HAVE_STRCHRNUL
-#undef HAVE_VASPRINTF
+# undef HAVE_FDPRINTF
+# undef HAVE_MEMRCHR
+# undef HAVE_MKDTEMP
+# undef HAVE_SETBIT
+# undef HAVE_STRCASESTR
+# undef HAVE_STRCHRNUL
+# undef HAVE_STRSIGNAL
+# undef HAVE_VASPRINTF
 #endif
 
 #if defined(__FreeBSD__)
-#undef HAVE_STRCHRNUL
+# undef HAVE_STRCHRNUL
 #endif
 
 /*
@@ -353,16 +363,38 @@ typedef unsigned smalluint;
  * These must come after all the HAVE_* macros are defined (or not)
  */
 
+#ifndef HAVE_FDPRINTF
+extern int fdprintf(int fd, const char *format, ...);
+#endif
+
+#ifndef HAVE_MEMRCHR
+extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
+#endif
+
+#ifndef HAVE_MKDTEMP
+extern char *mkdtemp(char *template) FAST_FUNC;
+#endif
+
+#ifndef HAVE_SETBIT
+# define setbit(a, b)  ((a)[(b) >> 3] |= 1 << ((b) & 7))
+# define clrbit(a, b)  ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
+#endif
+
+#ifndef HAVE_STRCASESTR
+extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
+#endif
+
 #ifndef HAVE_STRCHRNUL
 extern char *strchrnul(const char *s, int c) FAST_FUNC;
 #endif
 
+#ifndef HAVE_STRSIGNAL
+/* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
+# define strsignal(sig) get_signame(sig)
+#endif
+
 #ifndef HAVE_VASPRINTF
 extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
 #endif
 
-#ifndef HAVE_FDPRINTF
-extern int fdprintf(int fd, const char *format, ...);
-#endif
-
 #endif

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