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61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/*
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# ctype.h
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Character classification and conversion functions.
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# unsigned char typecast
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I think it is required to avoid undefined behaviour, because
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char may or not be signed
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http://stackoverflow.com/questions/2054939/is-char-signed-or-unsigned-by-default
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and ctype functions UB if input is neither fits into `unsigned char` nor is EOF.
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Mentioned at: http://www.greenend.org.uk/rjk/tech/cfu.html
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Conversions to unsigned types are always defined (modulo),
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and char -> unsigned char is a bijection.
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*/
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#include "common.h"
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int main(void) {
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/* # isspace */
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{
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assert(isspace((unsigned char)' '));
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assert(isspace((unsigned char)'\n'));
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assert(!isspace((unsigned char)'a'));
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}
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/* # isdigit */
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{
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assert(isdigit((unsigned char)'0'));
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assert(!isdigit((unsigned char)'a'));
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}
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/* # ispunct */
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{
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assert(ispunct((unsigned char)'"'));
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assert(ispunct((unsigned char)'('));
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assert(ispunct((unsigned char)'.'));
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assert(!ispunct((unsigned char)'a'));
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assert(!ispunct((unsigned char)'0'));
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}
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/*
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# toupper
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# tolower
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Work on characters.
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There is no built-in string version:
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http://stackoverflow.com/questions/2661766/c-convert-a-mixed-case-string-to-all-lower-case
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*/
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{
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assert(tolower((unsigned char)'A') == 'a');
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assert(toupper((unsigned char)'a') == 'A');
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}
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return EXIT_SUCCESS;
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}
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