From 723828d1d473b70f77fa7878f855c2956ddcacc4 Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom@tomsmeding.com>
Date: Sun, 14 Jul 2024 09:48:55 +0200
Subject: Gebruik option parsing in kat en tak

---
 src/kat.c | 75 ++++++++++++++++++++++++++++++++++--------------
 src/tak.c | 97 ++++++++++++++++++++++++++++++++++++++++++---------------------
 2 files changed, 119 insertions(+), 53 deletions(-)

(limited to 'src')

diff --git a/src/kat.c b/src/kat.c
index 7efa7e1..399e466 100644
--- a/src/kat.c
+++ b/src/kat.c
@@ -1,35 +1,68 @@
-#include <fcntl.h>
-#include <stdio.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
 #include <unistd.h>
 
 #include "util/map.h"
+#include "util/versie.h"
 
-int entry_kat(int argc, char **argv) {
-  if (argc == 2 && strcmp(argv[1], "-h") == 0) {
-    fprintf(stderr, "Gebruik: kat [BESTAND]...\n"
-                    "\n"
-                    "Schakel BESTAND(en) aaneen naar standaard uitvoer.\n");
-    return 0;
-  }
+static void usage(FILE *f) {
+  fprintf(f,
+      "Gebruik: kat [-hV] <bestand...>\n"
+      "\n"
+      "Schakel bestanden aaneen naar standaard uitvoer.\n"
+      "\n"
+      "  -h    Toon deze hulptekst\n"
+      "  -V    Toon versienummer\n");
+}
 
-  for (int i = 1; i < argc; i++) {
-    const char *fname = argv[i];
-    struct map *map = open_map(fname);
-    if (map == NULL) {
-      return 1;
+// Returns pointer to argument array containing the file names
+static char** parse_options(int argc, char **argv) {
+  int opt;
+  while ((opt = getopt(argc, argv, "hV")) != -1) {
+    switch (opt) {
+      case 'h':
+        usage(stdout);
+        exit(0);
+
+      case 'V':
+        drukkedoos_print_versie(stdout, "kat");
+        exit(0);
+
+      case '?':
+        usage(stderr);
+        exit(1);
     }
+  }
+
+  return argv + optind;
+}
+
+static void process(const char *fname) {
+  struct map *map = open_map(fname);
+  if (map == NULL) {
+    exit(1);
+  }
 
-    if (map->sb.st_size >= 0) {
-      for (size_t i = 0; i < (size_t)map->sb.st_size; i++) {
-        putchar(map->addr[i]);
-      }
+  if (map->sb.st_size >= 0) {
+    for (size_t i = 0; i < (size_t)map->sb.st_size; i++) {
+      putchar(map->addr[i]);
     }
+  }
 
-    close_map(map);
+  close_map(map);
+}
+
+int entry_kat(int argc, char **argv) {
+  char **args = parse_options(argc, argv);
+  if (*args == NULL) {
+    fprintf(stderr, "kat: Standaard invoer niet ondersteund in deze projectie-gebaseerde implementatie\n");
+    return 1;
+  } else {
+    while (*args != NULL) {
+      process(*args);
+      args++;
+    }
   }
 
   return 0;
diff --git a/src/tak.c b/src/tak.c
index efdc806..64a07a7 100644
--- a/src/tak.c
+++ b/src/tak.c
@@ -1,50 +1,83 @@
-#include <fcntl.h>
-#include <stdio.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
 #include <unistd.h>
 
 #include "util/map.h"
+#include "util/versie.h"
 
-int entry_tak(int argc, char **argv) {
-  if (argc == 2 && strcmp(argv[1], "-h") == 0) {
-    fprintf(stderr, "Gebruik: tak [BESTAND]...\n"
-                    "\n"
-                    "Schakel BESTAND(en) aaneen naar standaard uitvoer omgekeerd.\n");
-    return 0;
-  }
+static void usage(FILE *f) {
+  fprintf(f,
+      "Gebruik: tak [-hV] <bestand...>\n"
+      "\n"
+      "Schakel bestanden aaneen naar standaard uitvoer omgekeerd.\n"
+      "\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 opt;
+  while ((opt = getopt(argc, argv, "hV")) != -1) {
+    switch (opt) {
+      case 'h':
+        usage(stdout);
+        exit(0);
 
-  for (int i = argc-1; i >= 1; i--) {
-    const char *fname = argv[i];
-    struct map *map = open_map(fname);
-    if (map == NULL) {
-      return 1;
+      case 'V':
+        drukkedoos_print_versie(stdout, "tak");
+        exit(0);
+
+      case '?':
+        usage(stderr);
+        exit(1);
     }
+  }
 
-    char *lstart, *lend;
-    lend = &map->addr[map->sb.st_size - 1];
+  return argv + optind;
+}
 
-    while (lend > map->addr) {
-      if (*lend == '\n') {
-        lend--;
-      }
+static void process(const char *fname) {
+  struct map *map = open_map(fname);
+  if (map == NULL) {
+    exit(1);
+  }
 
-      lstart = lend;
-      while (*lstart != '\n' && lstart != map->addr) {
-        lstart--;
-      }
-      if (lstart != map->addr) {
-        lstart++;
-      }
+  char *lstart, *lend;
+  lend = &map->addr[map->sb.st_size - 1];
 
-      fwrite(lstart, 1, lend - lstart + 2, stdout);
+  while (lend > map->addr) {
+    if (*lend == '\n') {
+      lend--;
+    }
 
-      lend = lstart-1;
+    lstart = lend;
+    while (*lstart != '\n' && lstart != map->addr) {
+      lstart--;
+    }
+    if (lstart != map->addr) {
+      lstart++;
     }
 
-    close_map(map);
+    fwrite(lstart, 1, lend - lstart + 2, stdout);
+
+    lend = lstart-1;
+  }
+
+  close_map(map);
+}
+
+int entry_tak(int argc, char **argv) {
+  char **args = parse_options(argc, argv);
+  if (*args == NULL) {
+    fprintf(stderr, "tak: Standaard invoer niet ondersteund in deze projectie-gebaseerde implementatie\n");
+    return 1;
+  } else {
+    while (*args != NULL) {
+      process(*args);
+      args++;
+    }
   }
 
   return 0;
-- 
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