terom@4: #include "util.h"
terom@4: 
terom@4: #include <string.h>
terom@4: 
terom@4: int chfext (char *buf, size_t len, const char *newext)
terom@4: {
terom@4:     char *ext;
terom@4: 
terom@4:     // find .ext
terom@4:     if ((ext = strrchr(buf, '.')) == NULL)
terom@4:         return -1;
terom@4: 
terom@4:     // check length
terom@4:     if (ext + strlen(newext) >= buf + len)
terom@4:         return -1;
terom@4: 
terom@4:     // change to .foo
terom@4:     strcpy(ext, newext);
terom@4:     
terom@4:     // ok
terom@4:     return 0;
terom@4: }
terom@4: 
terom@4: int path_with_fext (const char *path, char *buf, size_t len, const char *newext)
terom@4: {
terom@4:     // verify length
terom@4:     if (strlen(path) > len)
terom@4:         return -1;
terom@4: 
terom@4:     // copy filename
terom@4:     strcpy(buf, path);
terom@4: 
terom@4:     // change fext
terom@4:     return chfext(buf, len, newext);
terom@4: }