From fefe914802c8592d6539f33865902326fba4525e Mon Sep 17 00:00:00 2001
From: Lieuwe Rooijakkers <lieuwerooijakkers@gmail.com>
Date: Sun, 21 Jul 2024 17:08:25 +0200
Subject: tak: sta standaard invoer toe

---
 src/tak.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 49 insertions(+), 13 deletions(-)

diff --git a/src/tak.c b/src/tak.c
index 64a07a7..3aa4d84 100644
--- a/src/tak.c
+++ b/src/tak.c
@@ -1,3 +1,4 @@
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -38,25 +39,25 @@ static char** parse_options(int argc, char **argv) {
   return argv + optind;
 }
 
-static void process(const char *fname) {
-  struct map *map = open_map(fname);
-  if (map == NULL) {
-    exit(1);
-  }
+struct state {
+  char *buf;
+  size_t sz;
+};
 
+static void process(struct state state) {
   char *lstart, *lend;
-  lend = &map->addr[map->sb.st_size - 1];
+  lend = &state.buf[state.sz - 1];
 
-  while (lend > map->addr) {
+  while (lend > state.buf) {
     if (*lend == '\n') {
       lend--;
     }
 
     lstart = lend;
-    while (*lstart != '\n' && lstart != map->addr) {
+    while (*lstart != '\n' && lstart != state.buf) {
       lstart--;
     }
-    if (lstart != map->addr) {
+    if (lstart != state.buf) {
       lstart++;
     }
 
@@ -64,18 +65,53 @@ static void process(const char *fname) {
 
     lend = lstart-1;
   }
+}
+
+static char *read_stdin(size_t *sz) {
+  const size_t CHUNK_SIZE = 4096;
+
+  size_t cap = CHUNK_SIZE;
+  char *res = malloc(cap);
+
+  while (!feof(stdin)) {
+    if (cap-*sz < CHUNK_SIZE) {
+      cap *= 2;
+      res = realloc(res, cap);
+    }
+
+    const size_t n = fread(res+*sz, 1, CHUNK_SIZE, stdin);
+    *sz += n;
+
+    if (n != CHUNK_SIZE && !feof(stdin)) {
+      fprintf(stderr, "tak: fout tijdens lezen van standaard invoer.\n");
+      exit(1);
+    }
+  }
 
-  close_map(map);
+  return res;
 }
 
 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;
+    size_t sz = 0;
+    char *data = read_stdin(&sz);
+
+    struct state state = { .buf = data, .sz = sz };
+    process(state);
+
+    free(data);
   } else {
     while (*args != NULL) {
-      process(*args);
+      struct map *map = open_map(*args);
+      if (map == NULL) {
+        return 1;
+      }
+
+      struct state state = { .buf = map->addr, .sz = map->sb.st_size };
+      process(state);
+
+      close_map(map);
       args++;
     }
   }
-- 
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