cvs.zerfleddert.de Git - micropolis/blame_incremental - src/tcl/compat/strtol.c

/*
 * strtol.c --
 *
 *	Source code for the "strtol" library procedure.
 *
 * Copyright 1988 Regents of the University of California
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies.  The University of California
 * makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 */

#ifndef lint
static char rcsid[] = "$Header: /sprite/src/lib/tcl/compat/RCS/strtol.c,v 1.1 91/09/22 15:42:49 ouster Exp $ SPRITE (Berkeley)";
#endif /* not lint */

#include <ctype.h>

\f
/*
 *----------------------------------------------------------------------
 *
 * strtol --
 *
 *	Convert an ASCII string into an integer.
 *
 * Results:
 *	The return value is the integer equivalent of string.  If endPtr
 *	is non-NULL, then *endPtr is filled in with the character
 *	after the last one that was part of the integer.  If string
 *	doesn't contain a valid integer value, then zero is returned
 *	and *endPtr is set to string.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

long int
strtol(string, endPtr, base)
    char *string;		/* String of ASCII digits, possibly
				 * preceded by white space.  For bases
				 * greater than 10, either lower- or
				 * upper-case digits may be used.
				 */
    char **endPtr;		/* Where to store address of terminating
				 * character, or NULL. */
    int base;			/* Base for conversion.  Must be less
				 * than 37.  If 0, then the base is chosen
				 * from the leading characters of string:
				 * "0x" means hex, "0" means octal, anything
				 * else means decimal.
				 */
{
    register char *p;
    int result;

    /*
     * Skip any leading blanks.
     */

    p = string;
    while (isspace(*p)) {
	p += 1;
    }

    /*
     * Check for a sign.
     */

    if (*p == '-') {
	p += 1;
	result = -(strtoul(p, endPtr, base));
    } else {
	if (*p == '+') {
	    p += 1;
	}
	result = strtoul(p, endPtr, base);
    }
    if ((result == 0) && (endPtr != 0) && (*endPtr == p)) {
	*endPtr = string;
    }
    return result;
}
Commit	Line	Data
	1	/*
	2	* strtol.c --
	3	*
	4	* Source code for the "strtol" library procedure.
	5	*
	6	* Copyright 1988 Regents of the University of California
	7	* Permission to use, copy, modify, and distribute this
	8	* software and its documentation for any purpose and without
	9	* fee is hereby granted, provided that the above copyright
	10	* notice appear in all copies. The University of California
	11	* makes no representations about the suitability of this
	12	* software for any purpose. It is provided "as is" without
	13	* express or implied warranty.
	14	*/
	15
	16	#ifndef lint
	17	static char rcsid[] = "$Header: /sprite/src/lib/tcl/compat/RCS/strtol.c,v 1.1 91/09/22 15:42:49 ouster Exp $ SPRITE (Berkeley)";
	18	#endif /* not lint */
	19
	20	#include <ctype.h>
	21
	22	\f
	23	/*
	24	*----------------------------------------------------------------------
	25	*
	26	* strtol --
	27	*
	28	* Convert an ASCII string into an integer.
	29	*
	30	* Results:
	31	* The return value is the integer equivalent of string. If endPtr
	32	* is non-NULL, then *endPtr is filled in with the character
	33	* after the last one that was part of the integer. If string
	34	* doesn't contain a valid integer value, then zero is returned
	35	* and *endPtr is set to string.
	36	*
	37	* Side effects:
	38	* None.
	39	*
	40	*----------------------------------------------------------------------
	41	*/
	42
	43	long int
	44	strtol(string, endPtr, base)
	45	char string; / String of ASCII digits, possibly
	46	* preceded by white space. For bases
	47	* greater than 10, either lower- or
	48	* upper-case digits may be used.
	49	*/
	50	char *endPtr; / Where to store address of terminating
	51	* character, or NULL. */
	52	int base; /* Base for conversion. Must be less
	53	* than 37. If 0, then the base is chosen
	54	* from the leading characters of string:
	55	* "0x" means hex, "0" means octal, anything
	56	* else means decimal.
	57	*/
	58	{
	59	register char *p;
	60	int result;
	61
	62	/*
	63	* Skip any leading blanks.
	64	*/
	65
	66	p = string;
	67	while (isspace(*p)) {
	68	p += 1;
	69	}
	70
	71	/*
	72	* Check for a sign.
	73	*/
	74
	75	if (*p == '-') {
	76	p += 1;
	77	result = -(strtoul(p, endPtr, base));
	78	} else {
	79	if (*p == '+') {
	80	p += 1;
	81	}
	82	result = strtoul(p, endPtr, base);
	83	}
	84	if ((result == 0) && (endPtr != 0) && (*endPtr == p)) {
	85	*endPtr = string;
	86	}
	87	return result;
	88	}