Justin C. Miller
95a35cd0bf
Moving libc from its separate repo into this one, minor resulting build fixes, and a hacky way to add -I for libc headers in builds.
26 lines
758 B
C
26 lines
758 B
C
/* _PDCLIB_atomax( const char * )
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This file is part of the Public Domain C Library (PDCLib).
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Permission is granted to use, modify, and / or redistribute at will.
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*/
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#include <string.h>
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#include <ctype.h>
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intmax_t _PDCLIB_atomax( const char * s )
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{
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intmax_t rc = 0;
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char sign = '+';
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const char * x;
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/* TODO: In other than "C" locale, additional patterns may be defined */
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while ( isspace( *s ) ) ++s;
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if ( *s == '+' ) ++s;
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else if ( *s == '-' ) sign = *(s++);
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/* TODO: Earlier version was missing tolower() but was not caught by tests */
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while ( ( x = memchr( _PDCLIB_digits, tolower(*(s++)), 10 ) ) != NULL )
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{
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rc = rc * 10 + ( x - _PDCLIB_digits );
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}
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return ( sign == '+' ) ? rc : -rc;
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}
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