From 993424547df0d253d546dbe7adee9b2448294b08 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 15 Jun 2024 11:42:29 -0700
Subject: Add dynamically-sized strings.
---
cstring/src/cstring.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 103 insertions(+)
create mode 100644 cstring/src/cstring.c
(limited to 'cstring/src')
diff --git a/cstring/src/cstring.c b/cstring/src/cstring.c
new file mode 100644
index 0000000..832cb85
--- /dev/null
+++ b/cstring/src/cstring.c
@@ -0,0 +1,103 @@
+#include <cstring.h>
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+string string_new(const char* cstr) {
+ const size_t length = strlen(cstr);
+ const size_t size = length + 1;
+
+ char* data = calloc(size, sizeof(char));
+ ASSERT(data);
+ if (length > 0) {
+ memcpy(data, cstr, length);
+ }
+
+ return (string){
+ .data = data,
+ .length = length,
+ };
+}
+
+void string_del(string* str) {
+ if (str->data) {
+ free((void*)str->data);
+ str->data = 0;
+ str->length = 0;
+ }
+}
+
+string string_concat(string left, string right) {
+ const size_t length = left.length + right.length;
+ const size_t size = length + 1;
+
+ char* data = calloc(size, sizeof(char));
+ ASSERT(data);
+ if (length > 0) {
+ memcpy(data, left.data, left.length);
+ memcpy(data + left.length, right.data, right.length);
+ }
+
+ return (string){
+ .data = data,
+ .length = length,
+ };
+}
+
+string string_from_size(size_t size) {
+ const size_t length = snprintf(NULL, 0, "%zu", size) + 1;
+ char* data = calloc(length, sizeof(char));
+ ASSERT(data);
+ snprintf(data, length, "%zu", size);
+ return (string){
+ .data = data,
+ .length = length,
+ };
+}
+
+string string_format_size(size_t size) {
+ const size_t multiples[] = {1073741824, 1048576, 1024, 1};
+ const char* units[] = {"G", "M", "K", "B"};
+
+ size_t integer = 0;
+ size_t fractional = 0;
+
+ int i;
+ for (i = 0; i < 4; ++i) {
+ const size_t m = multiples[i];
+ if (size >= m) {
+ integer = size / m;
+ fractional = size % m;
+ break;
+ }
+ }
+
+ double s;
+ const char* unit;
+ const char* format;
+ if (i == 4) { // 0
+ s = (double)size;
+ unit = "";
+ format = "%f%s";
+ } else if (i == 3) { // Bytes
+ s = (double)integer + (double)fractional / (double)multiples[i];
+ unit = units[i];
+ format = "%.0f%s";
+ } else { // KB, MB, GB
+ assert(i >= 0);
+ assert(i < 3);
+ s = (double)integer + (double)fractional / (double)multiples[i];
+ unit = units[i];
+ format = "%.2f%s";
+ }
+
+ const size_t length = snprintf(NULL, 0, format, s, unit) + 1;
+ char* data = calloc(length, sizeof(char));
+ ASSERT(data);
+ snprintf(data, length, format, s, unit);
+ return (string){
+ .data = data,
+ .length = length,
+ };
+}
--
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