X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Finttypes%2Fstrtoimax.c;fp=functions%2Finttypes%2Fstrtoimax.c;h=af29d3df999acf685d85503bd51509ce88358459;hb=440307cefe82c48ef22e85ef351db43046a60df6;hp=0000000000000000000000000000000000000000;hpb=81af09721ed3ac131915e24ce9af5af447ed1553;p=pdclib.old

diff --git a/functions/inttypes/strtoimax.c b/functions/inttypes/strtoimax.c
new file mode 100755
index 0000000..af29d3d
--- /dev/null
+++ b/functions/inttypes/strtoimax.c
@@ -0,0 +1,126 @@
+/* $Id$ */
+
+/* strtoimax( 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>
+
+intmax_t strtoimax( const char * _PDCLIB_restrict nptr, char ** _PDCLIB_restrict endptr, int base )
+{
+    intmax_t rc;
+    char sign = '+';
+    const char * p = _PDCLIB_strtox_prelim( nptr, &sign, &base );
+    if ( base < 2 || base > 36 ) return 0;
+    if ( sign == '+' )
+    {
+        rc = (intmax_t)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)INTMAX_MAX, (uintmax_t)( INTMAX_MAX / base ), (int)( INTMAX_MAX % base ), &sign );
+    }
+    else
+    {
+        /* FIXME: This breaks on some machines that round negatives wrongly */
+        /* FIXME: Sign error not caught by testdriver */
+        rc = (intmax_t)_PDCLIB_strtox_main( &p, (unsigned)base, (uintmax_t)INTMAX_MIN, (uintmax_t)( INTMAX_MIN / -base ), (int)( -( INTMAX_MIN % 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( strtoimax( "123", NULL, 10 ) == 123 );
+    /* proper detecting of default base 10 */
+    TESTCASE( strtoimax( "456", NULL, 0 ) == 456 );
+    /* proper functioning to smaller base */
+    TESTCASE( strtoimax( "14", NULL, 8 ) == 12 );
+    /* proper autodetecting of octal */
+    TESTCASE( strtoimax( "016", NULL, 0 ) == 14 );
+    /* proper autodetecting of hexadecimal, lowercase 'x' */
+    TESTCASE( strtoimax( "0xFF", NULL, 0 ) == 255 );
+    /* proper autodetecting of hexadecimal, uppercase 'X' */
+    TESTCASE( strtoimax( "0Xa1", NULL, 0 ) == 161 );
+    /* proper handling of border case: 0x followed by non-hexdigit */
+    TESTCASE( strtoimax( tricky, &endptr, 0 ) == 0 );
+    TESTCASE( endptr == tricky + 2 );
+    /* proper handling of border case: 0 followed by non-octdigit */
+    TESTCASE( strtoimax( 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( strtoimax( overflow, &endptr, 36 ) == INTMAX_MIN );
+    TESTCASE( errno == ERANGE );
+    TESTCASE( ( endptr - overflow ) == 53 );
+    /* same for positive */
+    errno = 0;
+    TESTCASE( strtoimax( overflow + 1, &endptr, 36 ) == INTMAX_MAX );
+    TESTCASE( errno == ERANGE );
+    TESTCASE( ( endptr - overflow ) == 53 );
+    /* testing skipping of leading whitespace */
+    TESTCASE( strtoimax( " \n\v\t\f789", NULL, 0 ) == 789 );
+    /* testing conversion failure */
+    TESTCASE( strtoimax( overflow, &endptr, 10 ) == 0 );
+    TESTCASE( endptr == overflow );
+    endptr = NULL;
+    TESTCASE( strtoimax( overflow, &endptr, 0 ) == 0 );
+    TESTCASE( endptr == overflow );
+    /* These tests assume two-complement, but conversion should work for   */
+    /* one-complement and signed magnitude just as well. Anyone having a   */
+    /* platform to test this on?                                           */
+    errno = 0;
+#if INTMAX_MAX == 0x7fffffffffffffffLL
+    /* testing "even" overflow, i.e. base is power of two */
+    TESTCASE( strtoimax( "0x7FFFFFFFFFFFFFFF", NULL, 0 ) == 0x7fffffffffffffff );
+    TESTCASE( errno == 0 );
+    TESTCASE( strtoimax( "0x8000000000000000", NULL, 0 ) == INTMAX_MAX );
+    TESTCASE( errno == ERANGE );
+    errno = 0;
+    TESTCASE( strtoimax( "-0x7FFFFFFFFFFFFFFF", NULL, 0 ) == (long long)0x8000000000000001 );
+    TESTCASE( errno == 0 );
+    TESTCASE( strtoimax( "-0x8000000000000000", NULL, 0 ) == INTMAX_MIN );
+    TESTCASE( errno == 0 );
+    TESTCASE( strtoimax( "-0x8000000000000001", NULL, 0 ) == INTMAX_MIN );
+    TESTCASE( errno == ERANGE );
+    /* TODO: test "odd" overflow, i.e. base is not power of two */
+#elif INTMAX_MAX == 0x7fffffffffffffffffffffffffffffffLL
+    /* testing "even" overflow, i.e. base is power of two */
+    TESTCASE( strtoimax( "0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", NULL, 0 ) == 0x7fffffffffffffffffffffffffffffff );
+    TESTCASE( errno == 0 );
+    TESTCASE( strtoimax( "0x80000000000000000000000000000000", NULL, 0 ) == INTMAX_MAX );
+    TESTCASE( errno == ERANGE );
+    errno = 0;
+    TESTCASE( strtoimax( "-0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", NULL, 0 ) == -0x80000000000000000000000000000001 );
+    TESTCASE( errno == 0 );
+    TESTCASE( strtoimax( "-0x80000000000000000000000000000000", NULL, 0 ) == INTMAX_MIN );
+    TESTCASE( errno == 0 );
+    TESTCASE( strtoimax( "-0x80000000000000000000000000000001", NULL, 0 ) == INTMAX_MIN );
+    TESTCASE( errno == ERANGE );
+    /* TODO: test "odd" overflow, i.e. base is not power of two */
+#else
+#error Unsupported width of 'long long' (neither 64 nor 128 bit).
+#endif
+    return TEST_RESULTS;
+}
+
+#endif