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1.1 root 1: /*
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 = i*10 + *((*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 = 2*sizeof(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:
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