Add strndup implemention for environments that are missing it

Signed-off-by: Dan McGee <dan@archlinux.org>

2 files changed, 26 insertions, 0 deletions

diff --git a/src/pacman/util.c b/src/pacman/util.c
index e182f38f..ecdb2ad8 100644
--- a/src/pacman/util.c
+++ b/src/pacman/util.c
@@ -515,4 +515,26 @@ int pm_vfprintf(FILE *stream, pmloglevel_t level, const char *format, va_list ar
 	return(ret);
 }
 
+#ifndef HAVE_STRNDUP
+/* A quick and dirty implementation derived from glibc */
+static size_t strnlen(const char *s, size_t max)
+{
+    register const char *p;
+    for(p = s; *p && max--; ++p);
+    return(p - s);
+}
+
+char *strndup(const char *s, size_t n)
+{
+  size_t len = strnlen(s, n);
+  char *new = (char *) malloc(len + 1);
+
+  if (new == NULL)
+    return NULL;
+
+  new[len] = '\0';
+  return (char *) memcpy(new, s, len);
+}
+#endif
+
 /* vim: set ts=2 sw=2 noet: */
diff --git a/src/pacman/util.h b/src/pacman/util.h
index 2814a780..4d17b179 100644
--- a/src/pacman/util.h
+++ b/src/pacman/util.h
@@ -53,6 +53,10 @@ int pm_printf(pmloglevel_t level, const char *format, ...) __attribute__((format
 int pm_fprintf(FILE *stream, pmloglevel_t level, const char *format, ...) __attribute__((format(printf,3,4)));
 int pm_vfprintf(FILE *stream, pmloglevel_t level, const char *format, va_list args) __attribute__((format(printf,3,0)));
 
+#ifndef HAVE_STRNDUP
+char *strndup(const char *s, size_t n);
+#endif
+
 #endif /* _PM_UTIL_H */
 
 /* vim: set ts=2 sw=2 noet: */