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[vrlugburz] / src / fs.c

diff --git a/src/fs.c b/src/fs.c
new file mode 100644 (file)
index 0000000..099e890
--- /dev/null
+++ b/src/fs.c
@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <string.h>
+#include <alloca.h>
+#include "fs.h"
+
+char *path_dir(const char *path, char *buf)
+{
+       char *sep;
+
+       if(!buf) buf = (char*)path;
+       if(path != buf) {
+               strcpy(buf, path);
+       }
+
+       if((sep = strrchr(buf, '/')) && sep > buf) {
+               *sep = 0;
+       }
+       return buf;
+}
+
+char *path_file(const char *path, char *buf)
+{
+       int len;
+       char *sep;
+
+       if(!buf) buf = (char*)path;
+       if(path != buf) {
+               strcpy(buf, path);
+       }
+
+       if((sep = strrchr(buf, '/'))) {
+               len = strlen(sep + 1);
+               memmove(buf, sep + 1, len + 1);
+       }
+       return buf;
+}
+
+char *combine_path(const char *dirname, const char *fname, char *buf)
+{
+       char *dest;
+
+       if(!buf) return 0;
+
+       if(!dirname || !*dirname) {
+               strcpy(buf, fname);
+               return buf;
+       }
+
+       dest = buf;
+       while(*dirname) *dest++ = *dirname++;
+
+       if(dest[-1] != '/') *dest++ = '/';
+
+       strcpy(dest, fname);
+       return buf;
+}
+
+FILE *fopenat(const char *dirname, const char *fname, const char *attr)
+{
+       char *buf;
+
+       if(!dirname || !*dirname) {
+               return fopen(fname, attr);
+       }
+
+       buf = alloca(strlen(dirname) + strlen(fname) + 2);
+       combine_path(dirname, fname, buf);
+       return fopen(buf, attr);
+}