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/*
 * strtoul.c --
 *
 *      Source code for the "strtoul" library procedure.
 *
 * Copyright (c) 1988 The Regents of the University of California.
 * Copyright (c) 1994 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: strtoul.c,v 1.1.1.1 2002-01-16 10:25:23 markom Exp $
 */
 
#include <ctype.h>
 
/*
 * The table below is used to convert from ASCII digits to a
 * numerical equivalent.  It maps from '0' through 'z' to integers
 * (100 for non-digit characters).
 */
 
static char cvtIn[] = {
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9,                /* '0' - '9' */
    100, 100, 100, 100, 100, 100, 100,          /* punctuation */
    10, 11, 12, 13, 14, 15, 16, 17, 18, 19,     /* 'A' - 'Z' */
    20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
    30, 31, 32, 33, 34, 35,
    100, 100, 100, 100, 100, 100,               /* punctuation */
    10, 11, 12, 13, 14, 15, 16, 17, 18, 19,     /* 'a' - 'z' */
    20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
    30, 31, 32, 33, 34, 35};
 
/*
 *----------------------------------------------------------------------
 *
 * strtoul --
 *
 *      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.
 *
 *----------------------------------------------------------------------
 */
 
unsigned long int
strtoul(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;
    register unsigned long int result = 0;
    register unsigned digit;
    int anyDigits = 0;
 
    /*
     * Skip any leading blanks.
     */
 
    p = string;
    while (isspace(*p)) {
        p += 1;
    }
 
    /*
     * If no base was provided, pick one from the leading characters
     * of the string.
     */
 
    if (base == 0)
    {
        if (*p == '0') {
            p += 1;
            if (*p == 'x') {
                p += 1;
                base = 16;
            } else {
 
                /*
                 * Must set anyDigits here, otherwise "0" produces a
                 * "no digits" error.
                 */
 
                anyDigits = 1;
                base = 8;
            }
        }
        else base = 10;
    } else if (base == 16) {
 
        /*
         * Skip a leading "0x" from hex numbers.
         */
 
        if ((p[0] == '0') && (p[1] == 'x')) {
            p += 2;
        }
    }
 
    /*
     * Sorry this code is so messy, but speed seems important.  Do
     * different things for base 8, 10, 16, and other.
     */
 
    if (base == 8) {
        for ( ; ; p += 1) {
            digit = *p - '0';
            if (digit > 7) {
                break;
            }
            result = (result << 3) + digit;
            anyDigits = 1;
        }
    } else if (base == 10) {
        for ( ; ; p += 1) {
            digit = *p - '0';
            if (digit > 9) {
                break;
            }
            result = (10*result) + digit;
            anyDigits = 1;
        }
    } else if (base == 16) {
        for ( ; ; p += 1) {
            digit = *p - '0';
            if (digit > ('z' - '0')) {
                break;
            }
            digit = cvtIn[digit];
            if (digit > 15) {
                break;
            }
            result = (result << 4) + digit;
            anyDigits = 1;
        }
    } else {
        for ( ; ; p += 1) {
            digit = *p - '0';
            if (digit > ('z' - '0')) {
                break;
            }
            digit = cvtIn[digit];
            if (digit >= base) {
                break;
            }
            result = result*base + digit;
            anyDigits = 1;
        }
    }
 
    /*
     * See if there were any digits at all.
     */
 
    if (!anyDigits) {
        p = string;
    }
 
    if (endPtr != 0) {
        *endPtr = p;
    }
 
    return result;
}

Line No.	Rev	Author	Line
1	578	markom	`/*`
2			`* strtoul.c --`
3			`*`
4			`* Source code for the "strtoul" library procedure.`
5			`*`
6			`* Copyright (c) 1988 The Regents of the University of California.`
7			`* Copyright (c) 1994 Sun Microsystems, Inc.`
8			`*`
9			`* See the file "license.terms" for information on usage and redistribution`
10			`* of this file, and for a DISCLAIMER OF ALL WARRANTIES.`
11			`*`
12			`* RCS: @(#) $Id: strtoul.c,v 1.1.1.1 2002-01-16 10:25:23 markom Exp $`
13			`*/`
14
15			`#include <ctype.h>`
16
17			`/*`
18			`* The table below is used to convert from ASCII digits to a`
19			`* numerical equivalent. It maps from '0' through 'z' to integers`
20			`* (100 for non-digit characters).`
21			`*/`
22
23			`static char cvtIn[] = {`
24			`0, 1, 2, 3, 4, 5, 6, 7, 8, 9, /* '0' - '9' */`
25			`100, 100, 100, 100, 100, 100, 100, /* punctuation */`
26			`10, 11, 12, 13, 14, 15, 16, 17, 18, 19, /* 'A' - 'Z' */`
27			`20, 21, 22, 23, 24, 25, 26, 27, 28, 29,`
28			`30, 31, 32, 33, 34, 35,`
29			`100, 100, 100, 100, 100, 100, /* punctuation */`
30			`10, 11, 12, 13, 14, 15, 16, 17, 18, 19, /* 'a' - 'z' */`
31			`20, 21, 22, 23, 24, 25, 26, 27, 28, 29,`
32			`30, 31, 32, 33, 34, 35};`
33
34			`/*`
35			`*----------------------------------------------------------------------`
36			`*`
37			`* strtoul --`
38			`*`
39			`* Convert an ASCII string into an integer.`
40			`*`
41			`* Results:`
42			`* The return value is the integer equivalent of string. If endPtr`
43			`* is non-NULL, then *endPtr is filled in with the character`
44			`* after the last one that was part of the integer. If string`
45			`* doesn't contain a valid integer value, then zero is returned`
46			`* and *endPtr is set to string.`
47			`*`
48			`* Side effects:`
49			`* None.`
50			`*`
51			`*----------------------------------------------------------------------`
52			`*/`
53
54			`unsigned long int`
55			`strtoul(string, endPtr, base)`
56			`char string; / String of ASCII digits, possibly`
57			`* preceded by white space. For bases`
58			`* greater than 10, either lower- or`
59			`* upper-case digits may be used.`
60			`*/`
61			`char *endPtr; / Where to store address of terminating`
62			`* character, or NULL. */`
63			`int base; /* Base for conversion. Must be less`
64			`* than 37. If 0, then the base is chosen`
65			`* from the leading characters of string:`
66			`* "0x" means hex, "0" means octal, anything`
67			`* else means decimal.`
68			`*/`
69			`{`
70			`register char *p;`
71			`register unsigned long int result = 0;`
72			`register unsigned digit;`
73			`int anyDigits = 0;`
74
75			`/*`
76			`* Skip any leading blanks.`
77			`*/`
78
79			`p = string;`
80			`while (isspace(*p)) {`
81			`p += 1;`
82			`}`
83
84			`/*`
85			`* If no base was provided, pick one from the leading characters`
86			`* of the string.`
87			`*/`
88
89			`if (base == 0)`
90			`{`
91			`if (*p == '0') {`
92			`p += 1;`
93			`if (*p == 'x') {`
94			`p += 1;`
95			`base = 16;`
96			`} else {`
97
98			`/*`
99			`* Must set anyDigits here, otherwise "0" produces a`
100			`* "no digits" error.`
101			`*/`
102
103			`anyDigits = 1;`
104			`base = 8;`
105			`}`
106			`}`
107			`else base = 10;`
108			`} else if (base == 16) {`
109
110			`/*`
111			`* Skip a leading "0x" from hex numbers.`
112			`*/`
113
114			`if ((p[0] == '0') && (p[1] == 'x')) {`
115			`p += 2;`
116			`}`
117			`}`
118
119			`/*`
120			`* Sorry this code is so messy, but speed seems important. Do`
121			`* different things for base 8, 10, 16, and other.`
122			`*/`
123
124			`if (base == 8) {`
125			`for ( ; ; p += 1) {`
126			`digit = *p - '0';`
127			`if (digit > 7) {`
128			`break;`
129			`}`
130			`result = (result << 3) + digit;`
131			`anyDigits = 1;`
132			`}`
133			`} else if (base == 10) {`
134			`for ( ; ; p += 1) {`
135			`digit = *p - '0';`
136			`if (digit > 9) {`
137			`break;`
138			`}`
139			`result = (10*result) + digit;`
140			`anyDigits = 1;`
141			`}`
142			`} else if (base == 16) {`
143			`for ( ; ; p += 1) {`
144			`digit = *p - '0';`
145			`if (digit > ('z' - '0')) {`
146			`break;`
147			`}`
148			`digit = cvtIn[digit];`
149			`if (digit > 15) {`
150			`break;`
151			`}`
152			`result = (result << 4) + digit;`
153			`anyDigits = 1;`
154			`}`
155			`} else {`
156			`for ( ; ; p += 1) {`
157			`digit = *p - '0';`
158			`if (digit > ('z' - '0')) {`
159			`break;`
160			`}`
161			`digit = cvtIn[digit];`
162			`if (digit >= base) {`
163			`break;`
164			`}`
165			`result = result*base + digit;`
166			`anyDigits = 1;`
167			`}`
168			`}`
169
170			`/*`
171			`* See if there were any digits at all.`
172			`*/`
173
174			`if (!anyDigits) {`
175			`p = string;`
176			`}`
177
178			`if (endPtr != 0) {`
179			`*endPtr = p;`
180			`}`
181
182			`return result;`
183			`}`

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[/] [or1k_old/] [trunk/] [insight/] [tcl/] [compat/] [strtoul.c] - Blame information for rev 1765