First commit

src/basic.c

@@ -0,0 +1,87 @@
+#include <stddef.h>
+#include <stdint.h>
+
+#include "basic.h"
+
+b32 is_space(char c)
+{
+    return c == ' ' || c == '\t' || c == '\r' || c == '\n';
+}
+
+b32 is_digit(char c)
+{
+    return c >= '0' && c <= '9';
+}
+
+b32 is_alpha(char c)
+{
+    return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
+}
+
+b32 is_printable(char c)
+{
+    return c >= ' ' && c <= '~';
+}
+
+b32 is_hex_digit(char c)
+{
+    return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
+}
+
+char to_lower(char c)
+{
+    if (c >= 'A' && c <= 'Z')
+        return c - 'A' + 10;
+    return c;
+}
+
+int hex_digit_to_int(char c)
+{
+    if (c >= 'a' && c <= 'f')
+        return c - 'a' + 10;
+
+    if (c >= 'A' && c <= 'F')
+        return c - 'A' + 10;
+
+    return c - '0';
+}
+
+
+b32 streq(String a, String b)
+{
+    if (a.len != b.len)
+        return false;
+    for (int i = 0; i < a.len; i++)
+        if (a.ptr[i] != b.ptr[i])
+            return false;
+    return true;
+}
+
+b32 streqcase(String a, String b)
+{
+    if (a.len != b.len)
+        return false;
+    for (int i = 0; i < a.len; i++)
+        if (to_lower(a.ptr[i]) != to_lower(b.ptr[i]))
+            return false;
+    return true;
+}
+
+void *alloc(Arena *a, int len, int align)
+{
+    int pad = -(intptr_t) (a->ptr + a->cur) & (align-1);
+    if (a->len - a->cur < len + pad)
+        return NULL;
+    void *ret = a->ptr + a->cur + pad;
+    a->cur += pad + len;
+    return ret;
+}
+
+b32 grow_alloc(Arena *a, char *p, int new_len)
+{
+    int new_cur = (p - a->ptr) + new_len;
+    if (new_cur > a->len)
+        return false;
+    a->cur = new_cur;
+    return true;
+}