From 7964e1f78b58d9c365361cc36b0422d9d56cd204 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Sun, 21 Apr 2019 19:23:45 -0500
Subject: A little more cleanup on gzip.

---
 toys/pending/gzip.c | 57 +++++++++++++++++++++++------------------------------
 1 file changed, 25 insertions(+), 32 deletions(-)

diff --git a/toys/pending/gzip.c b/toys/pending/gzip.c
index bc059dd6..56d1e46a 100644
--- a/toys/pending/gzip.c
+++ b/toys/pending/gzip.c
@@ -64,7 +64,7 @@ GLOBALS(
 #if CFG_TOYBOX_LIBZ
 #include <zlib.h>
 
-// Read fron in_fd, write to out_fd, decompress if dd else compress
+// Read from in_fd, write to out_fd, decompress if dd else compress
 static int do_deflate(int in_fd, int out_fd, int dd, int level)
 {
   int len, err = 0;
@@ -110,48 +110,41 @@ static int do_deflate(int in_fd, int out_fd, int dd, int level)
 
 #endif
 
-static void do_gzip(int in_fd, char *arg)
+static void do_gzip(int ifd, char *in)
 {
   struct stat sb;
-  int len, out_fd = 0;
-  char *out_name = 0;
+  char *out = 0;
+  int ofd = 0;
 
   // Are we writing to stdout?
-  if (!in_fd || (toys.optflags&FLAG_c)) out_fd = 1;
-  if (isatty(in_fd)) {
-    if (!(toys.optflags&FLAG_f))
-      return error_msg("%s:need -f to read TTY"+3*!!in_fd, arg);
-    else out_fd = 1;
+  if (!ifd || FLAG(c)) ofd = 1;
+  if (isatty(ifd)) {
+    if (!FLAG(f)) return error_msg("%s:need -f to read TTY"+3*!!ifd, in);
+    else ofd = 1;
   }
 
   // Are we reading file.gz to write to file?
-  if (!out_fd) {
-    if (fstat(in_fd, &sb)) return perror_msg("%s", arg);
-
-    if (!(toys.optflags&FLAG_d)) out_name = xmprintf("%s%s", arg, ".gz");
-    else {
-      // "gunzip x.gz" will decompress "x.gz" to "x".
-      if ((len = strlen(arg))<4 || strcmp(arg+len-3, ".gz"))
-        return error_msg("no .gz: %s", arg);
-      out_name = xstrdup(arg);
-      out_name[len-3] = 0;
-    }
-
-    out_fd = xcreate(out_name,
-      O_CREAT|O_WRONLY|WARN_ONLY|(O_EXCL*!(toys.optflags&FLAG_f)), sb.st_mode);
-    if (out_fd == -1) return;
+  if (!ofd) {
+    if (fstat(ifd, &sb)) return perror_msg("%s", in);
+
+    // Add or remove .gz suffix as necessary
+    if (!FLAG(d)) out = xmprintf("%s%s", in, ".gz");
+    else if ((out = strend(out, ".gz"))>in) out = xstrndup(out, out-in);
+    else return error_msg("no .gz: %s", in);
+
+    ofd = xcreate(out, O_CREAT|O_WRONLY|WARN_ONLY|(O_EXCL*!FLAG(f)),sb.st_mode);
+    if (ofd == -1) return;
   }
 
-  if (do_deflate(in_fd, out_fd, toys.optflags&FLAG_d, TT.level) && out_name)
-    arg = out_name;
-  if (out_fd != 1) close(out_fd);
+  if (do_deflate(ifd, ofd, FLAG(d), TT.level)) in = out;
 
-  if (out_name) {
-    struct timespec times[] = { sb.st_atim, sb.st_mtim };
+  if (out) {
+    struct timespec times[] = {sb.st_atim, sb.st_mtim};
 
-    if (utimensat(AT_FDCWD, out_name, times, 0)) perror_exit("utimensat");
-    if (!(toys.optflags&FLAG_k)) if (unlink(arg)) perror_msg("unlink %s", arg);
-    free(out_name);
+    if (futimens(ofd, times)) perror_exit("utimensat");
+    close(ofd);
+    if (!FLAG(k) && in && unlink(in)) perror_msg("unlink %s", in);
+    free(out);
   }
 }
 
-- 
cgit v1.2.3