usr/klibc/strntoumax.c

/*
 * strntoumax.c
 *
 * The strntoumax() function and associated
 */

#include <stddef.h>
#include <stdint.h>
#include <ctype.h>
#include <inttypes.h>

static inline int digitval(int ch)
{
	if (ch >= '0' && ch <= '9') {
		return ch - '0';
	} else if (ch >= 'A' && ch <= 'Z') {
		return ch - 'A' + 10;
	} else if (ch >= 'a' && ch <= 'z') {
		return ch - 'a' + 10;
	} else {
		return -1;
	}
}

uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n)
{
	int minus = 0;
	uintmax_t v = 0;
	int d;

	while (n && isspace((unsigned char)*nptr)) {
		nptr++;
		n--;
	}

	/* Single optional + or - */
	if (n) {
		char c = *nptr;
		if (c == '-' || c == '+') {
			minus = (c == '-');
			nptr++;
			n--;
		}
	}

	if (base == 0) {
		if (n >= 2 && nptr[0] == '0' &&
		    (nptr[1] == 'x' || nptr[1] == 'X')) {
			n -= 2;
			nptr += 2;
			base = 16;
		} else if (n >= 1 && nptr[0] == '0') {
			n--;
			nptr++;
			base = 8;
		} else {
			base = 10;
		}
	} else if (base == 16) {
		if (n >= 2 && nptr[0] == '0' &&
		    (nptr[1] == 'x' || nptr[1] == 'X')) {
			n -= 2;
			nptr += 2;
		}
	}

	while (n && (d = digitval(*nptr)) >= 0 && d < base) {
		v = v * base + d;
		n--;
		nptr++;
	}

	if (endptr)
		*endptr = (char *)nptr;

	return minus ? -v : v;
}
1	niro	532	/*
2			* strntoumax.c
3			*
4			* The strntoumax() function and associated
5			*/
6
7			#include <stddef.h>
8			#include <stdint.h>
9			#include <ctype.h>
10	niro	815	#include <inttypes.h>
11	niro	532
12			static inline int digitval(int ch)
13			{
14			if (ch >= '0' && ch <= '9') {
15			return ch - '0';
16			} else if (ch >= 'A' && ch <= 'Z') {
17			return ch - 'A' + 10;
18			} else if (ch >= 'a' && ch <= 'z') {
19			return ch - 'a' + 10;
20			} else {
21			return -1;
22			}
23			}
24
25			uintmax_t strntoumax(const char nptr, char *endptr, int base, size_t n)
26			{
27			int minus = 0;
28			uintmax_t v = 0;
29			int d;
30
31			while (n && isspace((unsigned char)*nptr)) {
32			nptr++;
33			n--;
34			}
35
36			/* Single optional + or - */
37			if (n) {
38			char c = *nptr;
39			if (c == '-' \|\| c == '+') {
40			minus = (c == '-');
41			nptr++;
42			n--;
43			}
44			}
45
46			if (base == 0) {
47			if (n >= 2 && nptr[0] == '0' &&
48			(nptr[1] == 'x' \|\| nptr[1] == 'X')) {
49			n -= 2;
50			nptr += 2;
51			base = 16;
52			} else if (n >= 1 && nptr[0] == '0') {
53			n--;
54			nptr++;
55			base = 8;
56			} else {
57			base = 10;
58			}
59			} else if (base == 16) {
60			if (n >= 2 && nptr[0] == '0' &&
61			(nptr[1] == 'x' \|\| nptr[1] == 'X')) {
62			n -= 2;
63			nptr += 2;
64			}
65			}
66
67			while (n && (d = digitval(*nptr)) >= 0 && d < base) {
68			v = v * base + d;
69			n--;
70			nptr++;
71			}
72
73			if (endptr)
74			endptr = (char )nptr;
75
76			return minus ? -v : v;
77			}