From 27eafc7b9caeadd54608f6ca0a32d9bc3c9b2c2d Mon Sep 17 00:00:00 2001
From: clfreville2 <clement.freville2@etu.uca.fr>
Date: Mon, 28 Nov 2022 11:40:21 +0100
Subject: [PATCH] string-builder: Ajoute un paquet pour construire des char*

---
 static-string-builder/Makefile           | 24 ++++++++++++++
 static-string-builder/oki.toml           |  5 +++
 static-string-builder/src/builder.c      | 42 ++++++++++++++++++++++++
 static-string-builder/src/builder.h      | 31 +++++++++++++++++
 static-string-builder/test/testBuilder.c | 35 ++++++++++++++++++++
 5 files changed, 137 insertions(+)
 create mode 100644 static-string-builder/Makefile
 create mode 100644 static-string-builder/oki.toml
 create mode 100644 static-string-builder/src/builder.c
 create mode 100644 static-string-builder/src/builder.h
 create mode 100644 static-string-builder/test/testBuilder.c

diff --git a/static-string-builder/Makefile b/static-string-builder/Makefile
new file mode 100644
index 0000000..483402c
--- /dev/null
+++ b/static-string-builder/Makefile
@@ -0,0 +1,24 @@
+CC = gcc
+CFLAGS = -Wall -Wextra
+
+all: test
+
+test: testBuilder
+	./testBuilder
+
+testBuilder: build/builder.o build/testBuilder.o
+	$(CC) -o $@ $^
+
+build/builder.o: src/builder.c src/builder.h | build
+	$(CC) $(CFLAGS) -c $< -o $@
+
+build/testBuilder.o: test/testBuilder.c src/builder.h | build
+	$(CC) $(CFLAGS) -Isrc/ -c $< -o $@
+
+build:
+	mkdir build
+
+clean:
+	rm -rf testBuilder build
+
+.PHONY: all test clean
diff --git a/static-string-builder/oki.toml b/static-string-builder/oki.toml
new file mode 100644
index 0000000..62d2bba
--- /dev/null
+++ b/static-string-builder/oki.toml
@@ -0,0 +1,5 @@
+[package]
+name = "static-string-builder"
+version = "0.1.1"
+description = "Global string builder"
+license = "MIT"
diff --git a/static-string-builder/src/builder.c b/static-string-builder/src/builder.c
new file mode 100644
index 0000000..ff7f048
--- /dev/null
+++ b/static-string-builder/src/builder.c
@@ -0,0 +1,42 @@
+#include "builder.h"
+
+#include <assert.h>
+#include <string.h>
+
+char tmp[TMP_CAP] = {};
+size_t tmp_size = 0;
+
+char *tmp_end(void) {
+    return tmp + tmp_size;
+}
+
+char *tmp_alloc(size_t size) {
+    assert(tmp_size + size <= TMP_CAP);
+    char *result = tmp_end();
+    tmp_size += size;
+    return result;
+}
+
+char *tmp_append_char(char c) {
+    assert(tmp_size < TMP_CAP);
+    tmp[tmp_size++] = c;
+    return tmp + tmp_size - 1;
+}
+
+char *tmp_append_sized(const char *buffer, size_t buffer_sz) {
+    char *result = tmp_alloc(buffer_sz);
+    return memcpy(result, buffer, buffer_sz);
+}
+
+char *tmp_append_cstr(const char *cstr) {
+    return tmp_append_sized(cstr, strlen(cstr));
+}
+
+void tmp_clean() {
+    tmp_size = 0;
+}
+
+void tmp_rewind(const char *end) {
+    tmp_size = end - tmp;
+}
+
diff --git a/static-string-builder/src/builder.h b/static-string-builder/src/builder.h
new file mode 100644
index 0000000..9f93ec9
--- /dev/null
+++ b/static-string-builder/src/builder.h
@@ -0,0 +1,31 @@
+#ifndef STATIC_STRING_BUILDER_H
+#define STATIC_STRING_BUILDER_H
+
+#include <stddef.h>
+
+#ifndef TMP_CAP
+#define TMP_CAP 1024
+#endif
+
+/**
+ * Get a pointer on the byte just after the last character of the buffer.
+ *
+ * @return A char pointer
+ */
+char *tmp_end(void);
+
+/**
+ * Append a new byte at the end of the current string builder.
+ *
+ * @param c The character to add
+ * @return A pointer just before the character was added
+ */
+char *tmp_append_char(char c);
+
+char *tmp_append_cstr(const char *cstr);
+
+void tmp_clean();
+
+void tmp_rewind(const char *end);
+
+#endif // STATIC_STRING_BUILDER_H
diff --git a/static-string-builder/test/testBuilder.c b/static-string-builder/test/testBuilder.c
new file mode 100644
index 0000000..127ed4b
--- /dev/null
+++ b/static-string-builder/test/testBuilder.c
@@ -0,0 +1,35 @@
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "builder.h"
+
+int main(void) {
+    char *result = tmp_end();
+    assert(*result == '\0');
+
+    tmp_append_char('a');
+    assert(strcmp(result, "a") == 0);
+    for (char c = 'b'; c <= 'z'; ++c) {
+        tmp_append_char(c);
+    }
+    char *end = tmp_append_char('\0');
+    assert(*end == '\0');
+    assert(strcmp(result, "abcdefghijklmnopqrstuvwxyz") == 0);
+
+    tmp_clean();
+    result = tmp_end();
+    tmp_append_cstr("Hello,");
+    char *comma = tmp_append_cstr(" world!");
+    tmp_append_char('\0');
+    assert(strcmp(comma, " world!") == 0);
+    assert(strcmp(result, "Hello, world!") == 0);
+
+    tmp_rewind(comma);
+    tmp_append_cstr(" the world!");
+    tmp_append_char('\0');
+    assert(strcmp(result, "Hello, the world!") == 0);
+
+    printf("Success!\n");
+    return 0;
+}