update formatting, improve error messages, use strftime()

1 files changed, 30 insertions, 12 deletions

diff --git a/fdate.c b/fdate.c
index 5a25803..d1a015a 100644
--- a/fdate.c
+++ b/fdate.c
@@ -1,21 +1,39 @@
 /* reads a filename from stdin and prints its time-last-modified,
    in format [d]d <Month-name> yyyy */
 
+#include <errno.h>
+#include <limits.h>
 #include <stdio.h>
-#include <sys/types.h>
+#include <string.h>
 #include <sys/stat.h>
-#include <unistd.h>
 #include <time.h>
+#include <unistd.h>
+
+#ifndef PATH_MAX
+#ifdef _XOPEN_PATH_MAX
+#define PATH_MAX _XOPEN_PATH_MAX
+#else
+#define PATH_MAX _POSIX_PATH_MAX
+#endif
+#endif
+
+int main(void)
+{
+  char buf[PATH_MAX];
+  if (scanf("%s", buf) != 1) {
+    fprintf(stderr, "fdate: invalid input\n");
+    return 1;
+  }
 
-struct stat buf;
-struct tm *t;
+  struct stat st;
+  if (stat(buf, &st) != 0) {
+    fprintf(stderr, "fdate: error reading date from \"%s\": %s\n", buf,
+      strerror(errno));
+    return 1;
+  }
 
-char *month[] = {"January","February","March","April","May","June",
-                "July","August","September","October","November","December"};
-int main()
-{ char f[200];
-  if(scanf("%s",f)==1&&stat(f,&buf)==0)
-    t=localtime(&buf.st_mtime),
-    printf("%d %s %4d\n",(*t).tm_mday,month[(*t).tm_mon],(*t).tm_year+1900);
-  else fprintf(stderr,"fdate: bad file \"%s\"\n",f);
+  struct tm *tm = localtime(&st.st_mtime);
+  strftime(buf, sizeof(buf), "%d %B %Y", tm);
+  puts(buf[0] == '0' ? buf + 1 : buf);
+  return 0;
 }