hoofd

1 files changed, 82 insertions, 0 deletions

diff --git a/src/hoofd.c b/src/hoofd.c
new file mode 100644
index 0000000..adbd87a
--- /dev/null
+++ b/src/hoofd.c
@@ -0,0 +1,82 @@
+#include <getopt.h>
+#include <pwd.h>
+#include <stdlib.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: hoofd [-nchV] [BESTAND]...\n"
+      "\n"
+      "Toon de eerste 10 regels van elk BESTAND naar standaard uitvoer\n"
+      "\n"
+      "  -n=AANTAL   Aantal regels om weer te geven\n"
+      "  -c=AANTAL   Aantal karakters om weer te geven\n"
+      "  -h          Toon deze hulptekst\n"
+      "  -V          Toon versienummer\n");
+}
+
+// Returns pointer to argument array containing the file names
+static char** parse_options(int argc, char **argv, int *n, int *c) {
+  int opt;
+  while ((opt = getopt(argc, argv, "n:c:hV")) != -1) {
+    switch (opt) {
+      case 'c':
+        if (optarg[0] == '=') optarg++;
+        *c = atoi(optarg);
+        *n = -1;
+        break;
+
+      case 'n':
+        if (optarg[0] == '=') optarg++;
+        *c = -1;
+        *n = atoi(optarg);
+        break;
+
+      case 'h':
+        usage(stdout);
+        exit(0);
+
+      case 'V':
+        drukkedoos_print_versie(stdout, "hoofd");
+        exit(0);
+
+      case '?':
+        usage(stderr);
+        exit(1);
+    }
+  }
+
+  return argv + optind;
+}
+
+int entry_hoofd(int argc, char **argv) {
+  int n = 10;
+  int c = -1;
+  char **args = parse_options(argc, argv, &n, &c);
+
+  while (*args != NULL) {
+    struct map *map = open_map(*args);
+    if (map == NULL) {
+      fprintf(stderr, "hoofd: fout bij lezen bestand");
+      return 1;
+    }
+
+    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--;
+    }
+    fwrite(map->addr, 1, i, stdout);
+
+    args++;
+  }
+
+  return 0;
+}