Enrico Fraccaroli (Galfurian)
126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
/// @file t_write_read.c
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/// @brief Test consecutive writes
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/// @copyright (c) 2024 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <strerror.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/unistd.h>
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int test_write_read()
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{
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char *filename = "t_write_read_file";
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mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
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int fd = creat(filename, mode);
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if (fd < 0) {
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printf("Failed to open file %s: %s\n", filename, strerror(errno));
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return 1;
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}
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if (write(fd, "foo", 3) != 3) {
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printf("First write to %s failed: %s\n", filename, strerror(errno));
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return 1;
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}
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if (write(fd, "bar", 3) != 3) {
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printf("Second write to %s failed: %s\n", filename, strerror(errno));
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return 1;
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}
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close(fd);
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fd = open(filename, O_RDONLY, 0);
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if (fd < 0) {
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printf("Failed to open file %s: %s\n", filename, strerror(errno));
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return 1;
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}
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ssize_t bytes_read;
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char buf[7];
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buf[6] = 0;
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if ((bytes_read = read(fd, &buf, 6)) < 0) {
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printf("Reading from file %s failed: %s\n", filename, strerror(errno));
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return 1;
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}
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close(fd);
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if (strcmp(buf, "foobar") != 0) {
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printf("Unexpected file content: %s\n", buf);
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return 1;
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}
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unlink(filename);
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return 0;
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}
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int test_truncate()
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{
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char *filename = "test.txt";
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mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
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char buffer[7];
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ssize_t bytes_read;
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int fd;
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// Create the file.
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fd = creat(filename, mode);
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if (fd < 0) {
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printf("Failed to open file %s: %s\n", filename, strerror(errno));
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return 1;
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}
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if (write(fd, "foobar", 6) != 6) {
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printf("First write to %s failed: %s\n", filename, strerror(errno));
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return 1;
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}
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close(fd);
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// Override the content.
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fd = open(filename, O_RDWR | O_TRUNC, 0);
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if (fd < 0) {
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printf("Failed to open file %s: %s\n", filename, strerror(errno));
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return 1;
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}
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if (write(fd, "bar", 3) != 3) {
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printf("Overriding the content of %s failed: %s\n", filename, strerror(errno));
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return 1;
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}
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// Go back to the beginning.
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lseek(fd, 0, SEEK_SET);
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// Read the content.
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if ((bytes_read = read(fd, &buffer, 6)) < 0) {
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printf("Reading from file %s failed: %s\n", filename, strerror(errno));
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return 1;
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}
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// Close the file.
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close(fd);
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printf("We found `%s`\n", buffer);
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if (strcmp(buffer, "bar") != 0) {
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printf("Unexpected file content: %s\n", buffer);
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return 1;
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}
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// Delete the file.
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unlink(filename);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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printf("Running `test_write_read`...\n");
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if (test_write_read()) {
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exit(EXIT_FAILURE);
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}
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printf("Running `test_truncate`...\n");
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if (test_truncate()) {
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exit(EXIT_FAILURE);
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}
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return EXIT_SUCCESS;
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}
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