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/*
 *  linux/lib/vsprintf.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */
 
/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
/*
 * Wirzenius wrote this portably, Torvalds fucked it up :-)
 */
 
#include <stdarg.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ctype.h>
 
unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
{
        unsigned long result = 0,value;
 
        if (!base) {
                base = 10;
                if (*cp == '0') {
                        base = 8;
                        cp++;
                        if ((*cp == 'x') && isxdigit(cp[1])) {
                                cp++;
                                base = 16;
                        }
                }
        }
        while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
            ? toupper(*cp) : *cp)-'A'+10) < base) {
                result = result*base + value;
                cp++;
        }
        if (endp)
                *endp = (char *)cp;
        return result;
}
 
/* we use this so that we can do without the ctype library */
#define is_digit(c)     ((c) >= '0' && (c) <= '9')
 
static int skip_atoi(const char **s)
{
        int i=0;
 
        while (is_digit(**s))
                i = i*10 + *((*s)++) - '0';
        return i;
}
 
#define ZEROPAD 1               /* pad with zero */
#define SIGN    2               /* unsigned/signed long */
#define PLUS    4               /* show plus */
#define SPACE   8               /* space if plus */
#define LEFT    16              /* left justified */
#define SPECIAL 32              /* 0x */
#define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
 
#define do_div(n,base) ({ \
int __res; \
__res = ((unsigned long) n) % (unsigned) base; \
n = ((unsigned long) n) / (unsigned) base; \
__res; })
 
static char * number(char * str, long num, int base, int size, int precision
        ,int type)
{
        char c,sign,tmp[66];
        const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
        int i;
 
        if (type & LARGE)
                digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        if (type & LEFT)
                type &= ~ZEROPAD;
        if (base < 2 || base > 36)
                return 0;
        c = (type & ZEROPAD) ? '0' : ' ';
        sign = 0;
        if (type & SIGN) {
                if (num < 0) {
                        sign = '-';
                        num = -num;
                        size--;
                } else if (type & PLUS) {
                        sign = '+';
                        size--;
                } else if (type & SPACE) {
                        sign = ' ';
                        size--;
                }
        }
        if (type & SPECIAL) {
                if (base == 16)
                        size -= 2;
                else if (base == 8)
                        size--;
        }
        i = 0;
        if (num == 0)
                tmp[i++]='0';
        else while (num != 0)
                tmp[i++] = digits[do_div(num,base)];
        if (i > precision)
                precision = i;
        size -= precision;
        if (!(type&(ZEROPAD+LEFT)))
                while(size-->0)
                        *str++ = ' ';
        if (sign)
                *str++ = sign;
        if (type & SPECIAL)
                if (base==8)
                        *str++ = '0';
                else if (base==16) {
                        *str++ = '0';
                        *str++ = digits[33];
                }
        if (!(type & LEFT))
                while (size-- > 0)
                        *str++ = c;
        while (i < precision--)
                *str++ = '0';
        while (i-- > 0)
                *str++ = tmp[i];
        while (size-- > 0)
                *str++ = ' ';
        return str;
}
 
int vsprintf(char *buf, const char *fmt, va_list args)
{
        int len;
        unsigned long num;
        int i, base;
        char * str;
        const char *s;
 
        int flags;              /* flags to number() */
 
        int field_width;        /* width of output field */
        int precision;          /* min. # of digits for integers; max
                                   number of chars for from string */
        int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 
        for (str=buf ; *fmt ; ++fmt) {
                if (*fmt != '%') {
                        *str++ = *fmt;
                        continue;
                }
 
                /* process flags */
                flags = 0;
                repeat:
                        ++fmt;          /* this also skips first '%' */
                        switch (*fmt) {
                                case '-': flags |= LEFT; goto repeat;
                                case '+': flags |= PLUS; goto repeat;
                                case ' ': flags |= SPACE; goto repeat;
                                case '#': flags |= SPECIAL; goto repeat;
                                case '0': flags |= ZEROPAD; goto repeat;
                                }
 
                /* get field width */
                field_width = -1;
                if (is_digit(*fmt))
                        field_width = skip_atoi(&fmt);
                else if (*fmt == '*') {
                        ++fmt;
                        /* it's the next argument */
                        field_width = va_arg(args, int);
                        if (field_width < 0) {
                                field_width = -field_width;
                                flags |= LEFT;
                        }
                }
 
                /* get the precision */
                precision = -1;
                if (*fmt == '.') {
                        ++fmt;
                        if (is_digit(*fmt))
                                precision = skip_atoi(&fmt);
                        else if (*fmt == '*') {
                                ++fmt;
                                /* it's the next argument */
                                precision = va_arg(args, int);
                        }
                        if (precision < 0)
                                precision = 0;
                }
 
                /* get the conversion qualifier */
                qualifier = -1;
                if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
                        qualifier = *fmt;
                        ++fmt;
                }
 
                /* default base */
                base = 10;
 
                switch (*fmt) {
                case 'c':
                        if (!(flags & LEFT))
                                while (--field_width > 0)
                                        *str++ = ' ';
                        *str++ = (unsigned char) va_arg(args, int);
                        while (--field_width > 0)
                                *str++ = ' ';
                        continue;
 
                case 's':
                        s = va_arg(args, char *);
                        if (!s)
                                s = "<NULL>";
 
                        len = strnlen(s, precision);
 
                        if (!(flags & LEFT))
                                while (len < field_width--)
                                        *str++ = ' ';
                        for (i = 0; i < len; ++i)
                                *str++ = *s++;
                        while (len < field_width--)
                                *str++ = ' ';
                        continue;
 
                case 'p':
                        if (field_width == -1) {
                                field_width = 2*sizeof(void *);
                                flags |= ZEROPAD;
                        }
                        str = number(str,
                                (unsigned long) va_arg(args, void *), 16,
                                field_width, precision, flags);
                        continue;
 
 
                case 'n':
                        if (qualifier == 'l') {
                                long * ip = va_arg(args, long *);
                                *ip = (str - buf);
                        } else {
                                int * ip = va_arg(args, int *);
                                *ip = (str - buf);
                        }
                        continue;
 
                /* integer number formats - set up the flags and "break" */
                case 'o':
                        base = 8;
                        break;
 
                case 'X':
                        flags |= LARGE;
                case 'x':
                        base = 16;
                        break;
 
                case 'd':
                case 'i':
                        flags |= SIGN;
                case 'u':
                        break;
 
                default:
                        if (*fmt != '%')
                                *str++ = '%';
                        if (*fmt)
                                *str++ = *fmt;
                        else
                                --fmt;
                        continue;
                }
                if (qualifier == 'l')
                        num = va_arg(args, unsigned long);
                else if (qualifier == 'h')
                        if (flags & SIGN)
                                num = va_arg(args, short);
                        else
                                num = va_arg(args, unsigned short);
                else if (flags & SIGN)
                        num = va_arg(args, int);
                else
                        num = va_arg(args, unsigned int);
                str = number(str, num, base, field_width, precision, flags);
        }
        *str = '\0';
        return str-buf;
}
 
int sprintf(char * buf, const char *fmt, ...)
{
        va_list args;
        int i;
 
        va_start(args, fmt);
        i=vsprintf(buf,fmt,args);
        va_end(args);
        return i;
}
 

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [lib/] [vsprintf.c] - Blame information for rev 199

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/lib/vsprintf.c`
3			`*`
4			`* Copyright (C) 1991, 1992 Linus Torvalds`
5			`*/`
6
7			`/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */`
8			`/*`
9			`* Wirzenius wrote this portably, Torvalds fucked it up :-)`
10			`*/`
11
12			`#include <stdarg.h>`
13			`#include <linux/types.h>`
14			`#include <linux/string.h>`
15			`#include <linux/ctype.h>`
16
17			`unsigned long simple_strtoul(const char cp,char *endp,unsigned int base)`
18			`{`
19			`unsigned long result = 0,value;`
20
21			`if (!base) {`
22			`base = 10;`
23			`if (*cp == '0') {`
24			`base = 8;`
25			`cp++;`
26			`if ((*cp == 'x') && isxdigit(cp[1])) {`
27			`cp++;`
28			`base = 16;`
29			`}`
30			`}`
31			`}`
32			`while (isxdigit(cp) && (value = isdigit(cp) ? cp-'0' : (islower(cp)`
33			`? toupper(cp) : cp)-'A'+10) < base) {`
34			`result = result*base + value;`
35			`cp++;`
36			`}`
37			`if (endp)`
38			`endp = (char )cp;`
39			`return result;`
40			`}`
41
42			`/* we use this so that we can do without the ctype library */`
43			`#define is_digit(c) ((c) >= '0' && (c) <= '9')`
44
45			`static int skip_atoi(const char **s)`
46			`{`
47			`int i=0;`
48
49			`while (is_digit(**s))`
50			`i = i10 + ((*s)++) - '0';`
51			`return i;`
52			`}`
53
54			`#define ZEROPAD 1 /* pad with zero */`
55			`#define SIGN 2 /* unsigned/signed long */`
56			`#define PLUS 4 /* show plus */`
57			`#define SPACE 8 /* space if plus */`
58			`#define LEFT 16 /* left justified */`
59			`#define SPECIAL 32 /* 0x */`
60			`#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */`
61
62			`#define do_div(n,base) ({ \`
63			`int __res; \`
64			`__res = ((unsigned long) n) % (unsigned) base; \`
65			`n = ((unsigned long) n) / (unsigned) base; \`
66			`__res; })`
67
68			`static char * number(char * str, long num, int base, int size, int precision`
69			`,int type)`
70			`{`
71			`char c,sign,tmp[66];`
72			`const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";`
73			`int i;`
74
75			`if (type & LARGE)`
76			`digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";`
77			`if (type & LEFT)`
78			`type &= ~ZEROPAD;`
79			`if (base < 2 \|\| base > 36)`
80			`return 0;`
81			`c = (type & ZEROPAD) ? '0' : ' ';`
82			`sign = 0;`
83			`if (type & SIGN) {`
84			`if (num < 0) {`
85			`sign = '-';`
86			`num = -num;`
87			`size--;`
88			`} else if (type & PLUS) {`
89			`sign = '+';`
90			`size--;`
91			`} else if (type & SPACE) {`
92			`sign = ' ';`
93			`size--;`
94			`}`
95			`}`
96			`if (type & SPECIAL) {`
97			`if (base == 16)`
98			`size -= 2;`
99			`else if (base == 8)`
100			`size--;`
101			`}`
102			`i = 0;`
103			`if (num == 0)`
104			`tmp[i++]='0';`
105			`else while (num != 0)`
106			`tmp[i++] = digits[do_div(num,base)];`
107			`if (i > precision)`
108			`precision = i;`
109			`size -= precision;`
110			`if (!(type&(ZEROPAD+LEFT)))`
111			`while(size-->0)`
112			`*str++ = ' ';`
113			`if (sign)`
114			`*str++ = sign;`
115			`if (type & SPECIAL)`
116			`if (base==8)`
117			`*str++ = '0';`
118			`else if (base==16) {`
119			`*str++ = '0';`
120			`*str++ = digits[33];`
121			`}`
122			`if (!(type & LEFT))`
123			`while (size-- > 0)`
124			`*str++ = c;`
125			`while (i < precision--)`
126			`*str++ = '0';`
127			`while (i-- > 0)`
128			`*str++ = tmp[i];`
129			`while (size-- > 0)`
130			`*str++ = ' ';`
131			`return str;`
132			`}`
133
134			`int vsprintf(char buf, const char fmt, va_list args)`
135			`{`
136			`int len;`
137			`unsigned long num;`
138			`int i, base;`
139			`char * str;`
140			`const char *s;`
141
142			`int flags; /* flags to number() */`
143
144			`int field_width; /* width of output field */`
145			`int precision; /* min. # of digits for integers; max`
146			`number of chars for from string */`
147			`int qualifier; /* 'h', 'l', or 'L' for integer fields */`
148
149			`for (str=buf ; *fmt ; ++fmt) {`
150			`if (*fmt != '%') {`
151			`str++ = fmt;`
152			`continue;`
153			`}`
154
155			`/* process flags */`
156			`flags = 0;`
157			`repeat:`
158			`++fmt; /* this also skips first '%' */`
159			`switch (*fmt) {`
160			`case '-': flags \|= LEFT; goto repeat;`
161			`case '+': flags \|= PLUS; goto repeat;`
162			`case ' ': flags \|= SPACE; goto repeat;`
163			`case '#': flags \|= SPECIAL; goto repeat;`
164			`case '0': flags \|= ZEROPAD; goto repeat;`
165			`}`
166
167			`/* get field width */`
168			`field_width = -1;`
169			`if (is_digit(*fmt))`
170			`field_width = skip_atoi(&fmt);`
171			`else if (fmt == '') {`
172			`++fmt;`
173			`/* it's the next argument */`
174			`field_width = va_arg(args, int);`
175			`if (field_width < 0) {`
176			`field_width = -field_width;`
177			`flags \|= LEFT;`
178			`}`
179			`}`
180
181			`/* get the precision */`
182			`precision = -1;`
183			`if (*fmt == '.') {`
184			`++fmt;`
185			`if (is_digit(*fmt))`
186			`precision = skip_atoi(&fmt);`
187			`else if (fmt == '') {`
188			`++fmt;`
189			`/* it's the next argument */`
190			`precision = va_arg(args, int);`
191			`}`
192			`if (precision < 0)`
193			`precision = 0;`
194			`}`
195
196			`/* get the conversion qualifier */`
197			`qualifier = -1;`
198			`if (fmt == 'h' \|\| fmt == 'l' \|\| *fmt == 'L') {`
199			`qualifier = *fmt;`
200			`++fmt;`
201			`}`
202
203			`/* default base */`
204			`base = 10;`
205
206			`switch (*fmt) {`
207			`case 'c':`
208			`if (!(flags & LEFT))`
209			`while (--field_width > 0)`
210			`*str++ = ' ';`
211			`*str++ = (unsigned char) va_arg(args, int);`
212			`while (--field_width > 0)`
213			`*str++ = ' ';`
214			`continue;`
215
216			`case 's':`
217			`s = va_arg(args, char *);`
218			`if (!s)`
219			`s = "<NULL>";`
220
221			`len = strnlen(s, precision);`
222
223			`if (!(flags & LEFT))`
224			`while (len < field_width--)`
225			`*str++ = ' ';`
226			`for (i = 0; i < len; ++i)`
227			`str++ = s++;`
228			`while (len < field_width--)`
229			`*str++ = ' ';`
230			`continue;`
231
232			`case 'p':`
233			`if (field_width == -1) {`
234			`field_width = 2sizeof(void );`
235			`flags \|= ZEROPAD;`
236			`}`
237			`str = number(str,`
238			`(unsigned long) va_arg(args, void *), 16,`
239			`field_width, precision, flags);`
240			`continue;`
241
242
243			`case 'n':`
244			`if (qualifier == 'l') {`
245			`long * ip = va_arg(args, long *);`
246			`*ip = (str - buf);`
247			`} else {`
248			`int * ip = va_arg(args, int *);`
249			`*ip = (str - buf);`
250			`}`
251			`continue;`
252
253			`/* integer number formats - set up the flags and "break" */`
254			`case 'o':`
255			`base = 8;`
256			`break;`
257
258			`case 'X':`
259			`flags \|= LARGE;`
260			`case 'x':`
261			`base = 16;`
262			`break;`
263
264			`case 'd':`
265			`case 'i':`
266			`flags \|= SIGN;`
267			`case 'u':`
268			`break;`
269
270			`default:`
271			`if (*fmt != '%')`
272			`*str++ = '%';`
273			`if (*fmt)`
274			`str++ = fmt;`
275			`else`
276			`--fmt;`
277			`continue;`
278			`}`
279			`if (qualifier == 'l')`
280			`num = va_arg(args, unsigned long);`
281			`else if (qualifier == 'h')`
282			`if (flags & SIGN)`
283			`num = va_arg(args, short);`
284			`else`
285			`num = va_arg(args, unsigned short);`
286			`else if (flags & SIGN)`
287			`num = va_arg(args, int);`
288			`else`
289			`num = va_arg(args, unsigned int);`
290			`str = number(str, num, base, field_width, precision, flags);`
291			`}`
292			`*str = '\0';`
293			`return str-buf;`
294			`}`
295
296			`int sprintf(char * buf, const char *fmt, ...)`
297			`{`
298			`va_list args;`
299			`int i;`
300
301			`va_start(args, fmt);`
302			`i=vsprintf(buf,fmt,args);`
303			`va_end(args);`
304			`return i;`
305			`}`
306