From 3145dd8188c4c807b5cfb6cd16a3e8088544f96e Mon Sep 17 00:00:00 2001
From: Lieuwe Rooijakkers <lieuwerooijakkers@gmail.com>
Date: Tue, 6 Aug 2024 19:34:00 +0200
Subject: simple grijp with fixed strings only

---
 src/grijp.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 src/grijp.c

diff --git a/src/grijp.c b/src/grijp.c
new file mode 100644
index 0000000..0c406f4
--- /dev/null
+++ b/src/grijp.c
@@ -0,0 +1,104 @@
+#include <assert.h>
+#include <errno.h>
+#include <getopt.h>
+#include <pwd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "util/debug.h"
+#include "util/error.h"
+#include "util/loop_args.h"
+#include "util/versie.h"
+
+#include "io/read_file.h"
+
+char *gpats;
+
+static void usage(FILE *f) {
+  fprintf(f,
+      "Gebruik: grijp [-hV] [PATRONEN] [BESTAND]...\n"
+      "\n"
+      "TODO\n"
+      "\n"
+      "  -h          Toon deze hulptekst\n"
+      "  -V          Toon versienummer\n");
+}
+
+// Returns pointer to argument array containing patterns and then 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);
+        exit(0);
+
+      case '?':
+        fprintf(stderr, "grijp: Ongeldige optie: -%c\n", optopt);
+        usage(stderr);
+        exit(1);
+    }
+  }
+
+  return argv + optind;
+}
+
+static int process(char *fname, bool isstdin) {
+  FILE *stream = isstdin ? stdin : fopen(fname, "rb");
+
+  char **patterns;
+  size_t npat = 0;
+  {
+    size_t cappat = 1 << 4;
+    patterns = calloc(sizeof(char*), cappat);
+
+    char *s = gpats;
+    char *pat = NULL;
+    while ((pat = strtok(s, "\n")) != NULL) {
+      s = NULL;
+
+      if (npat == cappat) {
+        cappat *= 2;
+        patterns = realloc(patterns, sizeof(char*)*cappat);
+      }
+      patterns[npat] = strdup(pat);
+      npat++;
+    }
+  }
+
+  char *line = NULL;
+  size_t linen = 0;
+
+  ssize_t nread = 0;
+  while ((errno = 0, nread = getline(&line, &linen, stream)) != -1) {
+    for (size_t i = 0; i < npat; i++) {
+      char *pat = patterns[i];
+      if (strstr(line, pat) == NULL) continue;
+      printf("%s", line);
+    }
+  }
+  free(line);
+
+  for (size_t i = 0; i < npat; i++) free(patterns[i]);
+  free(patterns);
+
+  return 0;
+}
+
+int entry_grijp(int argc, char **argv) {
+  char **args = parse_options(argc, argv);
+  if (*args == NULL) {
+    fprintf(stderr, "grijp: geen patroon gegeven\n");
+    return 1;
+  }
+
+  gpats = *args;
+  args++;
+  return loop_args(args, process);
+}
-- 
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