Josh Megnauth
1d5179eb71
The current buffer size is hard set to 256. Using const evaluation, the maximum buf size can be calculated at compile time.
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "test_helpers.h"
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int main(void) {
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chdir("nonexistent");
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int err = errno;
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printf("errno: %d = %s\n", err, strerror(errno));
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perror("perror");
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char buf1[256] = {0};
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int ret1 = strerror_r(err, buf1, 256);
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printf("errno: %d = %s, return: %d\n", err, buf1, ret1);
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char buf2[3] = {0};
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int ret2 = strerror_r(err, buf2, 3);
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printf("errno: %d = %s, return: %d\n", err, buf2, ret2);
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char buf3[256] = {0};
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int ret3 = strerror_r(err, buf3, 0);
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printf("errno: %d = %s, return: %d\n", err, buf3, ret3);
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// Test that the statically allocated buffer doesn't overflow
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for (int code = EPERM; code < ENOTRECOVERABLE; ++code) {
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const char* message = strerror(code);
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if (!message) {
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errx(EXIT_FAILURE,
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"Expected message for error code: %d",
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code
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);
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}
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}
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const char* actual_error = strerror(INT_MAX);
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char expected_error[256] = {0};
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sprintf(expected_error, "Unknown error %d", INT_MAX);
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if (strncmp(expected_error, actual_error, 25) != 0) {
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errx(EXIT_FAILURE,
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"Expected: %s\nGot: %s",
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expected_error, actual_error
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);
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}
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return EXIT_SUCCESS;
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}
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