user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/tests/posix/getdelim.c

@@ -0,0 +1,92 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <unistd.h>
+#include <string.h>
+
+#ifdef USE_HOST_LIBC
+#define TEST_FILE "getdelim-host-libc.tmp"
+#else
+#define TEST_FILE "getdelim.tmp"
+#endif
+
+int main(void) {
+	FILE *fp;
+	char *line = NULL;
+	size_t len = 0;
+	ssize_t read;
+
+	// We have to open the file for writing and then reading separately,
+	// as mlibc doesn't allow us to do both at the same time (yet).
+	fp = fopen(TEST_FILE, "w");
+	assert(fp);
+	fputs("foo\nbar\nbaz\nquux\n", fp);
+	fclose(fp);
+
+	fp = fopen(TEST_FILE, "r");
+	assert(fp);
+	while ((read = getline(&line, &len, fp)) != -1) {
+		printf("read line of length %zd, capacity %zu\n", read, len);
+	}
+	assert(!ferror(fp));
+	free(line);
+	fclose(fp);
+
+	size_t nchars = 10000;
+	fp = fopen(TEST_FILE, "w");
+	assert(fp);
+	for (size_t i = 0; i < nchars; i++)
+		fputc('a', fp);
+	fputc('b', fp);
+	fclose(fp);
+
+	line = NULL;
+	len = 0;
+	fp = fopen(TEST_FILE, "r");
+	assert(fp);
+	while ((read = getdelim(&line, &len, 'b', fp)) != -1) {
+		printf("read line of length %zd, capacity %zu\n", read, len);
+		assert((size_t)read == nchars + 1);
+	}
+
+	assert(len > nchars + 1);
+	assert(!ferror(fp));
+	assert(feof(fp));
+
+	assert(getdelim(&line, &len, 'b', fp) == -1);
+	assert(feof(fp));
+
+	free(line);
+	fclose(fp);
+
+	fp = fopen(TEST_FILE, "w");
+	assert(fp);
+	assert(fwrite("1234ef\0f", 1, 8, fp) == 8);
+	fclose(fp);
+
+	fp = fopen(TEST_FILE, "r");
+	assert(fp);
+
+	/* test with line = NULL and large len */
+	line = NULL;
+	len = (size_t) ~0;
+	assert(getdelim(&line, &len, 'e', fp) == 5);
+	assert(!memcmp(line, "1234e", 6));
+	assert(5 < len);
+
+	/* test handling of internal nulls */
+	assert(getdelim(&line, &len, 'e', fp) == 3);
+	assert(!memcmp(line, "f\0f", 4));
+	assert(3 < len);
+
+	/* test handling of EOF */
+	assert(getdelim(&line, &len, 'e', fp) == -1);
+
+	free(line);
+	fclose(fp);
+
+	// Delete the file
+	unlink(TEST_FILE);
+
+	return 0;
+}