From 64ee4628e219ef3653d3555b94ba091d12e7bb39 Mon Sep 17 00:00:00 2001
From: Lieuwe Rooijakkers <lieuwerooijakkers@gmail.com>
Date: Sun, 14 Jul 2024 16:53:22 +0200
Subject: toilet

---
 src/toilet.c   | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/util/map.c |   2 +-
 src/util/map.h |   1 +
 3 files changed, 125 insertions(+), 1 deletion(-)
 create mode 100644 src/toilet.c

diff --git a/src/toilet.c b/src/toilet.c
new file mode 100644
index 0000000..24b19a4
--- /dev/null
+++ b/src/toilet.c
@@ -0,0 +1,123 @@
+#include <assert.h>
+#include <ctype.h>
+#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"
+
+static void usage(FILE *f) {
+  fprintf(f,
+      "Gebruik: toilet [-nchV] [BESTAND]...\n"
+      "\n"
+      "Toon de hoevelheeid regels, woorden en beten for elk BESTAND\n"
+      "\n"
+      "  -c          Geef het aantal beten weer\n"
+      "  -w          Geef het aantal woorden weer\n"
+      "  -l          Geef het aantal regels weer\n"
+      "  -h          Toon deze hulptekst\n"
+      "  -V          Toon versienummer\n");
+}
+
+enum MODE {
+  M_BYTES,
+  M_WORDS,
+  M_LINES,
+};
+
+// Returns pointer to argument array containing the file names
+static char** parse_options(int argc, char **argv, enum MODE *mode) {
+  int opt;
+  while ((opt = getopt(argc, argv, "cwlhV")) != -1) {
+    switch (opt) {
+      case 'c':
+        *mode = M_BYTES;
+        break;
+
+      case 'w':
+        *mode = M_WORDS;
+        break;
+
+      case 'l':
+        *mode = M_LINES;
+        break;
+
+      case 'h':
+        usage(stdout);
+        exit(0);
+
+      case 'V':
+        drukkedoos_print_versie(stdout, "toilet");
+        exit(0);
+
+      case '?':
+        usage(stderr);
+        exit(1);
+    }
+  }
+
+  return argv + optind;
+}
+
+size_t get_count(enum MODE mode, struct map *map) {
+  switch (mode) {
+    case M_BYTES:
+      return map->sb.st_size;
+
+    case M_WORDS: {
+      size_t words = 0;
+
+      assert(map->sb.st_size >= 0);
+      for (size_t i = 0; i < (size_t)map->sb.st_size;) {
+        size_t previ = i;
+        while (!isspace(map->addr[i])) i++;
+        words += i != previ;
+        while (isspace(map->addr[i])) i++;
+      }
+
+      return words;
+    }
+
+    case M_LINES: {
+      size_t lines = 0;
+
+      while (map->addr != map->end) {
+        if (*map->addr == '\n') lines++;
+        map->addr++;
+      }
+
+      if (*(map->addr - 1) != '\n') {
+        lines++;
+      }
+
+      return lines;
+    }
+  }
+}
+
+int entry_toilet(int argc, char **argv) {
+  enum MODE mode;
+  char **args = parse_options(argc, argv, &mode);
+
+
+  while (*args != NULL) {
+    struct map *map = open_map(*args);
+    if (map == NULL) {
+      fprintf(stderr, "toilet: fout bij lezen bestand");
+      return 1;
+    }
+
+    size_t count = get_count(mode, map);
+    printf("%li %s\n", count, *args);
+
+    close_map(map);
+    args++;
+  }
+
+  return 0;
+}
diff --git a/src/util/map.c b/src/util/map.c
index 35e1b49..cd2da42 100644
--- a/src/util/map.c
+++ b/src/util/map.c
@@ -25,8 +25,8 @@ struct map *open_map(const char *fname) {
   }
 
   struct map *res = calloc(1, sizeof(struct map));
-
   res->addr = addr;
+  res->end = addr + sb.st_size;
   res->sb = sb;
   res->fd = fd;
   return res;
diff --git a/src/util/map.h b/src/util/map.h
index 232720f..67beb9c 100644
--- a/src/util/map.h
+++ b/src/util/map.h
@@ -2,6 +2,7 @@
 
 struct map {
   char *addr;
+  char *end;
   struct stat sb;
   int fd;
 };
-- 
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