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145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*
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** Test a function that formats and writes characters into a string buffer.
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** This program does not test formatting. It tests some behaviors that are
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** specific to the buffer. It tests that certain conditions are handled
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** properly.
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**
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** 2015-07-17, Greg King
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*/
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#include <conio.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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static const char format[] = "1234567890\nabcdefghijklmnopqrstuvwxyz\n%u\n%s\n\n";
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#define FORMAT_SIZE (sizeof format - 2u - 2u - 1u)
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#define arg1 12345u
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#define ARG1_SIZE (5u)
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static const char arg2[] = "!@#$%^&*()-+";
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#define ARG2_SIZE (sizeof arg2 - 1u)
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#define STRING_SIZE (FORMAT_SIZE + ARG1_SIZE + ARG2_SIZE)
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static char buf[256];
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static int size;
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static void fillbuf(void)
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{
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memset(buf, 0xFF, sizeof buf - 1u);
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buf[sizeof buf - 1u] = '\0';
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}
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unsigned char main(void)
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{
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static unsigned char failures = 0;
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/* Show what sprintf() should create. */
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if ((size = printf(format, arg1, arg2)) != STRING_SIZE) {
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++failures;
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printf("printf() gave the wrong size: %d.\n", size);
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}
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/* Test the normal behavior of sprintf(). */
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fillbuf();
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size = sprintf(buf, format, arg1, arg2);
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fputs(buf, stdout);
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if (size != STRING_SIZE) {
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++failures;
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printf("sprintf() gave the wrong size: %d.\n", size);
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}
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/* Test the normal behavior of snprintf(). */
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fillbuf();
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size = snprintf(buf, sizeof buf, format, arg1, arg2);
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fputs(buf, stdout);
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if (size != STRING_SIZE) {
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++failures;
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printf("snprintf(sizeof buf) gave the wrong size:\n %d.\n", size);
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}
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/* Does snprintf() return the full-formatted size even when the buffer
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** is short? Does it write beyond the end of that buffer?
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*/
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fillbuf();
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size = snprintf(buf, STRING_SIZE - 5u, format, arg1, arg2);
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if (size != STRING_SIZE) {
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++failures;
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printf("snprintf(STRING_SIZE-5) gave the wrong size:\n %d.\n", size);
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}
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if (buf[STRING_SIZE - 5u - 1u] != '\0' || buf[STRING_SIZE - 5u] != 0xFF) {
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++failures;
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printf("snprintf(STRING_SIZE-5) wrote beyond\n the end of the buffer.\n");
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}
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/* Does snprintf() detect a buffer size that is too big? */
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fillbuf();
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errno = 0;
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size = snprintf(buf, 0x8000, format, arg1, arg2);
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if (size >= 0) {
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++failures;
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printf("snprintf(0x8000) didn't give an error:\n %d; errno=%d.\n", size, errno);
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} else {
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printf("snprintf(0x8000) did give an error:\n errno=%d.\n", errno);
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}
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if (buf[0] != 0xFF) {
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++failures;
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printf("snprintf(0x8000) wrote into the buffer.\n");
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}
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/* snprintf() must measure the length of the formatted output even when the
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** buffer size is zero. But, it must not touch the buffer.
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*/
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fillbuf();
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size = snprintf(buf, 0, format, arg1, arg2);
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if (size != STRING_SIZE) {
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++failures;
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printf("snprintf(0) gave the wrong size:\n %d.\n", size);
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}
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if (buf[0] != 0xFF) {
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++failures;
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printf("snprintf(0) wrote into the buffer.\n");
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}
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/* Does sprintf() detect a zero buffer-pointer? */
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errno = 0;
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size = sprintf(NULL, format, arg1, arg2);
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if (size >= 0) {
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++failures;
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printf("sprintf(NULL) didn't give an error:\n %d; errno=%d.\n", size, errno);
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} else {
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printf("sprintf(NULL) did give an error:\n errno=%d.\n", errno);
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}
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/* snprintf() must measure the length of the formatted output even when the
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** buffer size is zero. A zero pointer is not an error, in that case.
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*/
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size = snprintf(NULL, 0, format, arg1, arg2);
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if (size != STRING_SIZE) {
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++failures;
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printf("snprintf(NULL,0) gave the wrong size:\n %d.\n", size);
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}
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if (failures != 0) {
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printf("There were %u", failures);
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} else {
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printf("There were no");
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}
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printf(" failures.\nTap a key. ");
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cgetc();
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return failures;
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}
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