1 files changed, 114 insertions, 0 deletions
diff --git a/ini/ini.h b/ini/ini.h
new file mode 100644
index 0000000..975df60
--- /dev/null
+++ b/ini/ini.h
@@ -0,0 +1,114 @@
+#ifndef INI_H
+#define INI_H
+
+
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_LINE_SIZE 256
+#define MAX_VALUE_SIZE 128
+
+typedef struct {
+  char* key;
+  char* value;
+} pair;
+
+typedef struct {
+  FILE* file;
+} ini_parser;
+
+/* loads the file at the given path into memory */
+static bool load_ini_file(ini_parser* p, const char* path) {
+  p->file = fopen(path, "r");
+  if (p->file == NULL)
+    return false;
+  return true;
+}
+
+/* unload file */
+void unload_ini_file(ini_parser* p) {
+  fclose(p->file);
+}
+
+static bool parse_line(char* line, pair* c) {
+  int32_t equal_index = strchr(line, '=')-line;
+  if (equal_index < 0) return false;
+
+  size_t len = strlen(line);
+  c->key = (char*)malloc(equal_index);
+  c->value = (char*)malloc(len - equal_index);
+
+  uint32_t key_start = 0; uint32_t value_start = 0;
+  bool start_value = false; bool start_key = false;
+  uint32_t prev_space = 0;
+  for (uint32_t i = 0; i < len; i++) {
+    if (i < (uint32_t)equal_index) {
+      if (line[i] == ' ' && !prev_space) {
+        prev_space = key_start;
+      } else if (line[i] != ' ') {
+        start_key = true;
+        prev_space = 0;
+      }
+      if (start_key)
+        c->key[key_start++] = line[i];
+    } else if (i > (uint32_t)equal_index) {
+      if (line[i] != ' ')
+        start_value = true;
+      if (start_value)
+        c->value[value_start++] = line[i];
+    }
+  }
+  if (prev_space) key_start = prev_space;
+  c->key[key_start] = '\0';
+  c->value[value_start] = '\0';
+  return true;
+}
+
+/* return value of matching pair with the given key and section */
+char* get_ini_value(ini_parser* p, const char* sec, const char* key) {
+  rewind(p->file); // reset file
+
+  char* value = (char*)malloc(MAX_VALUE_SIZE);
+
+  char* current_section = "root";
+  bool wait_till_next_section = true;
+
+  char* line = (char*)malloc(MAX_LINE_SIZE);
+  while (fgets(line, MAX_LINE_SIZE, p->file) != NULL) {
+    size_t len = strcspn(line, "\r\n");
+    line[len] = '\0';
+    if (len < 3) continue;
+    char front = *line;  // first character for the line
+    if (front == ';' || front == '#') continue;
+    else if (front == '[') {
+      line++;
+      current_section = (char*)malloc(len + 1);
+      strncpy(current_section, line, len);
+      current_section[len-2] = '\0';
+      wait_till_next_section = false;
+      continue;
+    }
+
+    if (wait_till_next_section) continue;
+
+    if (strcmp(current_section, sec) == 0) {
+      pair p;
+      if (!parse_line(line, &p))
+        continue;
+      if (strcmp(p.key, key) == 0) {
+        strcpy(value, p.value);
+        free(p.key); free(p.value);
+        free(current_section);
+        return value;
+      }
+    } else wait_till_next_section = true;
+  }
+  free(current_section);
+  return NULL;
+}
+
+#endif /* INI_H */