Added inttypes.h

[pdclib.old] / functions / inttypes / strtoumax.c

diff --git a/functions/inttypes/strtoumax.c b/functions/inttypes/strtoumax.c
new file mode 100755 (executable)
index 0000000..063e7ab
--- /dev/null
+++ b/functions/inttypes/strtoumax.c
@@ -0,0 +1,81 @@
+/* $Id$ */
+
+/* strtoumax( const char *, char * *, int )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <limits.h>
+#include <inttypes.h>
+
+#ifndef REGTEST
+
+#include <stddef.h>
+
+uintmax_t strtoumax( const char * _PDCLIB_restrict nptr, char ** _PDCLIB_restrict endptr, int base )
+{
+    uintmax_t rc;
+    char sign = '+';
+    const char * p = _PDCLIB_strtox_prelim( nptr, &sign, &base );
+    if ( base < 2 || base > 36 ) return 0;
+    rc = _PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)UINTMAX_MAX, (uintmax_t)( UINTMAX_MAX / base ), (int)( UINTMAX_MAX % base ), &sign );
+    if ( endptr != NULL ) *endptr = ( p != NULL ) ? (char *) p : (char *) nptr;
+    return ( sign == '+' ) ? rc : -rc;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+#include <errno.h>
+
+int main( void )
+{
+    char * endptr;
+    /* this, to base 36, overflows even a 256 bit integer */
+    char overflow[] = "-ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ_";
+    /* tricky border case */
+    char tricky[] = "+0xz";
+    errno = 0;
+    /* basic functionality */
+    TESTCASE( strtoumax( "123", NULL, 10 ) == 123 );
+    /* proper detecting of default base 10 */
+    TESTCASE( strtoumax( "456", NULL, 0 ) == 456 );
+    /* proper functioning to smaller base */
+    TESTCASE( strtoumax( "14", NULL, 8 ) == 12 );
+    /* proper autodetecting of octal */
+    TESTCASE( strtoumax( "016", NULL, 0 ) == 14 );
+    /* proper autodetecting of hexadecimal, lowercase 'x' */
+    TESTCASE( strtoumax( "0xFF", NULL, 0 ) == 255 );
+    /* proper autodetecting of hexadecimal, uppercase 'X' */
+    TESTCASE( strtoumax( "0Xa1", NULL, 0 ) == 161 );
+    /* proper handling of border case: 0x followed by non-hexdigit */
+    TESTCASE( strtoumax( tricky, &endptr, 0 ) == 0 );
+    TESTCASE( endptr == tricky + 2 );
+    /* proper handling of border case: 0 followed by non-octdigit */
+    TESTCASE( strtoumax( tricky, &endptr, 8 ) == 0 );
+    TESTCASE( endptr == tricky + 2 );
+    /* errno should still be 0 */
+    TESTCASE( errno == 0 );
+    /* overflowing subject sequence must still return proper endptr */
+    TESTCASE( strtoumax( overflow, &endptr, 36 ) == UINTMAX_MAX );
+    TESTCASE( errno == ERANGE );
+    TESTCASE( ( endptr - overflow ) == 53 );
+    /* same for positive */
+    errno = 0;
+    TESTCASE( strtoumax( overflow + 1, &endptr, 36 ) == UINTMAX_MAX );
+    TESTCASE( errno == ERANGE );
+    TESTCASE( ( endptr - overflow ) == 53 );
+    /* testing skipping of leading whitespace */
+    TESTCASE( strtoumax( " \n\v\t\f789", NULL, 0 ) == 789 );
+    /* testing conversion failure */
+    TESTCASE( strtoumax( overflow, &endptr, 10 ) == 0 );
+    TESTCASE( endptr == overflow );
+    endptr = NULL;
+    TESTCASE( strtoumax( overflow, &endptr, 0 ) == 0 );
+    TESTCASE( endptr == overflow );
+    return TEST_RESULTS;
+}
+
+#endif