X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;ds=sidebyside;f=functions%2F_PDCLIB%2F_PDCLIB_atomax.c;fp=functions%2F_PDCLIB%2F_PDCLIB_atomax.c;h=eaf7ced007d8f3f9114e5af0533b7b9a607c9a74;hb=d446b1531b82def47b9b684517a7c629c7400aab;hp=0000000000000000000000000000000000000000;hpb=c5c4350d2beb1ebe93f3f6d45643a64eed2a7c7a;p=pdclib

diff --git a/functions/_PDCLIB/_PDCLIB_atomax.c b/functions/_PDCLIB/_PDCLIB_atomax.c
new file mode 100644
index 0000000..eaf7ced
--- /dev/null
+++ b/functions/_PDCLIB/_PDCLIB_atomax.c
@@ -0,0 +1,46 @@
+/* _PDCLIB_atomax( const char * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <string.h>
+#include <ctype.h>
+
+#ifndef REGTEST
+
+_PDCLIB_intmax_t _PDCLIB_atomax( const char * s )
+{
+    _PDCLIB_intmax_t rc = 0;
+    char sign = '+';
+    const char * x;
+    /* TODO: In other than "C" locale, additional patterns may be defined     */
+    while ( isspace( *s ) ) ++s;
+    if ( *s == '+' ) ++s;
+    else if ( *s == '-' ) sign = *(s++);
+    /* TODO: Earlier version was missing tolower() but was not caught by tests */
+    while ( ( x = memchr( _PDCLIB_digits, tolower(*(s++)), 10 ) ) != NULL )
+    {
+        rc = rc * 10 + ( x - _PDCLIB_digits );
+    }
+    return ( sign == '+' ) ? rc : -rc;
+}
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+#ifndef REGTEST
+    /* basic functionality */
+    TESTCASE( _PDCLIB_atomax( "123" ) == 123 );
+    /* testing skipping of leading whitespace and trailing garbage */
+    TESTCASE( _PDCLIB_atomax( " \n\v\t\f123xyz" ) == 123 );
+#endif
+    return TEST_RESULTS;
+}
+
+#endif