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https://github.com/ibm-s390-linux/s390-tools.git
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b627b8d8e1
This commit is based on the s390-tools-1.39.0 version. Changes on top of s390-tools-1.39.0: - Add MIT license to all source files - Add LICENSE file - Transform REAMDE to README.md (markdown) - Add AUTHORS.md file - Add CONTRIBUTING.md file - Move changelog from README to CHANGELOG.md file Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/**
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* util_libc_example - Example program for util_libc
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*
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* Copyright IBM Corp. 2016, 2017
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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//! [code]
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#include <stdio.h>
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#include <stdlib.h>
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#include "lib/util_libc.h"
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#include "lib/util_panic.h"
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/*
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* Demonstrate that out of memory is automatically handled via panic()
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*/
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int main(void)
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{
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unsigned long ulong_max = (unsigned long)-1;
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void *ptr;
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char *zeroes, *str;
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/* Use util_strcat_realloc() for string concatenation */
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fprintf(stderr, "Try to concatenate \"Hello\", \", \" and \"world!\": ");
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str = util_strdup("Hello");
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str = util_strcat_realloc(str, ", ");
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str = util_strcat_realloc(str, "world!");
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fprintf(stderr, "result = \"%s\"\n", str);
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free(str);
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/* One byte allocation should work */
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fprintf(stderr, "Try to allocate 1 byte: ");
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ptr = util_malloc(1);
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fprintf(stderr, "done\n");
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/* One byte zeroed-allocation should work */
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fprintf(stderr, "Try to allocate 1 byte initialized with zeroes: ");
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zeroes = util_zalloc(1);
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fprintf(stderr, "done\n");
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util_assert(*zeroes == 0, "Garbage found in zero initialized memory\n");
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/* The next allocation will probably fail */
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fprintf(stderr, "Try to allocate %lu bytes:\n", ulong_max);
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ptr = util_malloc(ulong_max);
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fprintf(stderr, "You should not see me (ptr=%p)!\n", ptr);
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return EXIT_FAILURE;
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}
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//! [code]
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