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-rw-r--r--src/libstddjb/execvep.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/src/libstddjb/execvep.c b/src/libstddjb/execvep.c
new file mode 100644
index 0000000..1639236
--- /dev/null
+++ b/src/libstddjb/execvep.c
@@ -0,0 +1,38 @@
+/* ISC license. */
+
+#include <unistd.h>
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/djbunix.h>
+
+void execvep (char const *file, char const *const *argv, char const *const *envp, char const *path)
+{
+ if (!path) errno = EINVAL ;
+ else if (file[str_chr(file, '/')])
+ execve(file, (char *const *)argv, (char *const *)envp) ; /* execve prototype sucks */
+ else
+ {
+ unsigned int pathlen = str_len(path) + 1 ;
+ unsigned int filelen = str_len(file) ;
+ int savederrno = 0 ;
+ while (pathlen)
+ {
+ unsigned int split = byte_chr(path, pathlen - 1, ':') ;
+ if (split)
+ {
+ char tmp[split + 2 + filelen] ;
+ byte_copy(tmp, split, path) ;
+ tmp[split] = '/' ;
+ byte_copy(tmp + split + 1, filelen + 1, file) ;
+ execve(tmp, (char *const *)argv, (char *const *)envp) ;
+ if (errno != ENOENT)
+ {
+ savederrno = errno ;
+ if ((errno != EACCES) && (errno != EPERM) && (errno != EISDIR)) break ;
+ }
+ }
+ path += split+1 ; pathlen -= split+1 ;
+ }
+ if (savederrno) errno = savederrno ;
+ }
+}