From a0962d7311c057229a25ae5f30fc3e9645d6ff24 Mon Sep 17 00:00:00 2001
From: Lieuwe Rooijakkers <lieuwerooijakkers@gmail.com>
Date: Wed, 7 Aug 2024 23:03:14 +0200
Subject: regex grijp

---
 src/grijp.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 74 insertions(+), 5 deletions(-)

diff --git a/src/grijp.c b/src/grijp.c
index 0c406f4..9767c46 100644
--- a/src/grijp.c
+++ b/src/grijp.c
@@ -2,6 +2,7 @@
 #include <errno.h>
 #include <getopt.h>
 #include <pwd.h>
+#include <regex.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
@@ -16,6 +17,8 @@
 
 char *gpats;
 
+bool fixed, extended, icase;
+
 static void usage(FILE *f) {
   fprintf(f,
       "Gebruik: grijp [-hV] [PATRONEN] [BESTAND]...\n"
@@ -29,8 +32,15 @@ static void usage(FILE *f) {
 // 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) {
+  while ((opt = getopt(argc, argv, "FihV")) != -1) {
     switch (opt) {
+      case 'F':
+        fixed = true;
+        break;
+      case 'i':
+        icase = true;
+        break;
+
       case 'h':
         usage(stdout);
         exit(0);
@@ -49,9 +59,7 @@ static char** parse_options(int argc, char **argv) {
   return argv + optind;
 }
 
-static int process(char *fname, bool isstdin) {
-  FILE *stream = isstdin ? stdin : fopen(fname, "rb");
-
+static char **get_patterns(size_t *_npat) {
   char **patterns;
   size_t npat = 0;
   {
@@ -72,6 +80,62 @@ static int process(char *fname, bool isstdin) {
     }
   }
 
+  *_npat = npat;
+  return patterns;
+}
+
+static int process_regex(char *fname, bool isstdin) {
+  FILE *stream = isstdin ? stdin : fopen(fname, "rb");
+
+  size_t npat = 0;
+  char **patterns = get_patterns(&npat);
+
+  regex_t **regexps = calloc(sizeof(regex_t*), npat);
+  for (size_t i = 0; i < npat; i++) {
+    regex_t *regexp = calloc(1, sizeof(regex_t));
+
+    int flags = 0;
+    if (extended) flags |= REG_EXTENDED;
+    if (icase) flags |= REG_ICASE;
+
+    if (regcomp(regexp, patterns[i], flags) != 0) {
+      // TODO: error
+      return 1;
+    }
+
+    free(patterns[i]);
+    regexps[i] = regexp;
+  }
+  free(patterns);
+
+  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++) {
+      regex_t *regexp = regexps[i];
+
+      regmatch_t pmatch;
+      if (regexec(regexp, line, 1, &pmatch, 0) == 0) {
+        printf("%s", line);
+      }
+    }
+  }
+  free(line);
+
+  for (size_t i = 0; i < npat; i++) regfree(regexps[i]);
+  free(regexps);
+
+  return 0;
+}
+
+static int process_fixed(char *fname, bool isstdin) {
+  FILE *stream = isstdin ? stdin : fopen(fname, "rb");
+
+  size_t npat = 0;
+  char **patterns = get_patterns(&npat);
+
   char *line = NULL;
   size_t linen = 0;
 
@@ -100,5 +164,10 @@ int entry_grijp(int argc, char **argv) {
 
   gpats = *args;
   args++;
-  return loop_args(args, process);
+
+  if (fixed) {
+    return loop_args(args, process_fixed);
+  } else {
+    return loop_args(args, process_regex);
+  }
 }
-- 
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