3 /* _PDCLIB_strtox_prelim( const char *, char *, int * )
5 This file is part of the Public Domain C Library (PDCLib).
6 Permission is granted to use, modify, and / or redistribute at will.
12 const char * _PDCLIB_strtox_prelim( const char * p, char * sign, int * base )
14 /* skipping leading whitespace */
15 while ( isspace( *p ) ) ++p;
16 /* determining / skipping sign */
17 if ( *p != '+' && *p != '-' ) *sign = '+';
19 /* determining base */
23 if ( ( *base == 0 || *base == 16 ) && ( *p == 'x' || *p == 'X' ) )
28 else if ( *base == 0 )
41 return ( ( *base >= 2 ) && ( *base <= 36 ) ) ? p : NULL;
45 #include <_PDCLIB_test.h>
51 char test1[] = " 123";
52 char test2[] = "\t+0123";
53 char test3[] = "\v-0x123";
54 TESTCASE( _PDCLIB_strtox_prelim( test1, &sign, &base ) == &test1[2] );
55 TESTCASE( sign == '+' );
56 TESTCASE( base == 10 );
59 TESTCASE( _PDCLIB_strtox_prelim( test2, &sign, &base ) == &test2[3] );
60 TESTCASE( sign == '+' );
61 TESTCASE( base == 8 );
64 TESTCASE( _PDCLIB_strtox_prelim( test3, &sign, &base ) == &test3[4] );
65 TESTCASE( sign == '-' );
66 TESTCASE( base == 16 );
69 TESTCASE( _PDCLIB_strtox_prelim( test3, &sign, &base ) == &test3[2] );
70 TESTCASE( sign == '-' );
71 TESTCASE( base == 10 );
73 TESTCASE( _PDCLIB_strtox_prelim( test3, &sign, &base ) == NULL );
75 TESTCASE( _PDCLIB_strtox_prelim( test3, &sign, &base ) == NULL );