initial commit

include/utils.c

@@ -0,0 +1,72 @@
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "utils.h"
+#include "log.h"
+
+/**
+ * @brief get a substring of a string
+ *
+ * @param s string
+ * @param pos first pos
+ * @param l length
+ * @return the substring
+ */
+char
+*get_substring(char *s, int pos, int l)
+{
+  int i = 0;
+  char *out;
+
+  if (l <= 0) {
+    return NULL;
+  }
+
+  out = malloc((l + 1) * sizeof(char));
+  if (out == NULL) {
+    log_fatal("failed to get substring malloc: %s", strerror(errno));
+    exit(1);
+  }
+
+  /* Copy substring into ss */
+  while (i < l) {
+    out[i] = s[pos + i];
+    i++;
+  }
+
+  /* Null terminate the substring */
+  out[i] = '\0';
+
+  return out;
+}
+
+/**
+ * @brief concatinate two strings
+ *
+ * @param s1 first
+ * @param s2 second
+ * @return the concatinated string
+ */
+char
+*concat(const char *s1, const char *s2)
+{
+  int len1, len2;
+  char *result;
+
+  len1 = strlen(s1);
+  len2 = strlen(s2);
+
+  /* attempt to allocate size for the new string */
+  result = malloc(len1 + len2 + 1);
+  if (result == NULL) {
+    log_fatal("malloc: %s", strerror(errno));
+    exit(1);
+  }
+
+  memcpy(result, s1, len1);
+  memcpy(result + len1, s2, len2 + 1);
+                              // + 1 copies the null terminator
+
+  return result;
+}