From 19482e5ef5b6710b4b9a52edcb1bb39692336d7a Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sun, 15 Dec 2024 01:30:24 +0100
Subject: libc: Add setenv/getenv

---
 userland/libc/unistd/execvp.c | 46 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 43 insertions(+), 3 deletions(-)

(limited to 'userland/libc/unistd/execvp.c')

diff --git a/userland/libc/unistd/execvp.c b/userland/libc/unistd/execvp.c
index e38b4b7..af3ed29 100644
--- a/userland/libc/unistd/execvp.c
+++ b/userland/libc/unistd/execvp.c
@@ -1,8 +1,48 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <syscall.h>
+#include <tb/sb.h>
+#include <tb/sv.h>
 #include <unistd.h>
 
-// FIXME: Path resolution
+int execv(const char *pathname, char *const argv[]) {
+  struct SYS_EXEC_PARAMS args = {.path = pathname, .argv = (char **)argv};
+  RC_ERRNO(syscall(SYS_EXEC, &args, 0, 0, 0, 0));
+}
+
 int execvp(const char *file, char *const argv[]) {
-  struct SYS_EXEC_PARAMS args = {.path = file, .argv = (char **)argv};
-  return syscall(SYS_EXEC, &args, 0, 0, 0, 0);
+  if ('/' == *file) {
+    return execv(file, argv);
+  }
+
+  char *p = getenv("PATH");
+  if (!p) {
+    errno = ENOENT;
+    return -1;
+  }
+
+  struct sv paths = C_TO_SV(p);
+
+  struct sb builder;
+  sb_init(&builder);
+  for (;;) {
+    struct sv path = sv_split_delim(paths, &paths, ':');
+    if (0 == sv_length(path)) {
+      break;
+    }
+    sb_reset(&builder);
+    sb_append_sv(&builder, path);
+    sb_append(&builder, "/");
+    sb_append(&builder, file);
+    sb_append_buffer(&builder, "\0", 1);
+
+    if (-1 == execv(builder.string, argv)) {
+      continue;
+    }
+  }
+  sb_free(&builder);
+  errno = ENOENT;
+  return -1;
 }
-- 
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