Remove troublesome chars from cachefile names

Add a funtion cache_safe_filename() which replaces possibly bad filename
characters with '_'.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/cache.c b/cache.c
index 1ff1251..8df7c26 100644
--- a/cache.c
+++ b/cache.c
@@ -10,6 +10,22 @@
 
 const int NOLOCK = -1;
 
+char *cache_safe_filename(const char *unsafe)
+{
+        static char buf[PATH_MAX];
+        char *s = buf;
+        char c;
+
+        while(unsafe && (c = *unsafe++) != 0) {
+                if (c == '/' || c == ' ' || c == '&' || c == '|' || 
+                    c == '>' || c == '<' || c == '.')
+                        c = '_';
+                *s++ = c;
+        }
+        *s = '\0';
+        return buf;
+}
+
 int cache_exist(struct cacheitem *item)
 {
         if (stat(item->name, &item->st)) {