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