From f6bc3ed808a79ecab79fa10078775270db187e0c Mon Sep 17 00:00:00 2001
From: Lieuwe Rooijakkers <lieuwerooijakkers@gmail.com>
Date: Fri, 2 Aug 2024 23:03:36 +0200
Subject: hoofd: use read_file.h

---
 src/hoofd.c | 69 +++++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 51 insertions(+), 18 deletions(-)

diff --git a/src/hoofd.c b/src/hoofd.c
index f043f2b..3474b0b 100644
--- a/src/hoofd.c
+++ b/src/hoofd.c
@@ -1,12 +1,15 @@
 #include <getopt.h>
 #include <pwd.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 #include <unistd.h>
+
 #include "util/versie.h"
 #include "util/error.h"
 #include "util/debug.h"
-#include "util/map.h"
+
+#include "io/read_file.h"
 
 static void usage(FILE *f) {
   fprintf(f,
@@ -53,34 +56,64 @@ static char** parse_options(int argc, char **argv, int *n, int *c) {
   return argv + optind;
 }
 
+// TODO: be smarter, hoofd doesn't have to read the whole file in memory (for
+// unmappable files)
+
+static void process(struct filebuf *fb, int n, int c) {
+  size_t i;
+  for (i = 0; i < fb->sz && (n > 0 || n == -1) && (c > 0 || c == -1); i++) {
+    if (fb->buf[i] == '\n') {
+      if (n != -1) n--;
+    }
+    if (c != -1) c--;
+  }
+  fwrite(fb->buf, 1, i, stdout);
+
+  free_filebuf(fb);
+}
+
 int entry_hoofd(int argc, char **argv) {
   int n = 10;
   int c = -1;
   char **args = parse_options(argc, argv, &n, &c);
 
+  if (*args == NULL) {
+    struct filebuf *fb = stream_to_filebuf(stdin, 0);
+    if (fb == NULL) goto err_stdin;
+
+    process(fb, n, c);
+    return 0;
+  }
+
   while (*args != NULL) {
-    bool isdir;
-    struct map *map = open_map(*args, &isdir);
-    if (isdir) {
-      fprintf(stderr, "hoofd: %s: is een mapje\n", *args);
-      goto next;
-    } else if (map == NULL) {
-      fprintf(stderr, "hoofd: fout bij lezen bestand");
-      return 1;
-    }
+    struct filebuf *fb = NULL;
 
-    size_t i;
-    for (i = 0; i < (size_t)map->sb.st_size && (n > 0 || n == -1) && (c > 0 || c == -1); i++) {
-      if (map->addr[i] == '\n') {
-        if (n != -1) n--;
-      }
-      if (c != -1) c--;
+    if (!strcmp(*args, "-")) {
+      fb = stream_to_filebuf(stdin, 0);
+      if (fb == NULL) goto err_stdin;
+    } else {
+      bool isdir = false;
+      fb = file_to_filebuf(*args, 0, &isdir);
+      if (isdir) goto err_isdir;
+      else if (fb == NULL) goto err_file;
     }
-    fwrite(map->addr, 1, i, stdout);
 
-next:
+    process(fb, n, c);
+
     args++;
   }
 
   return 0;
+
+err_stdin:
+  fprintf(stderr, "hoofd: fout bij lezen van standaard invoer\n");
+  return 1;
+
+err_file:
+  fprintf(stderr, "hoofd: fout bij lezen van bestand\n");
+  return 1;
+
+err_isdir:
+  fprintf(stderr, "hoofd: bestand '%s' is een mapje\n", *args);
+  return 1;
 }
-- 
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