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* String functions for logger.
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* Copyright (C) 1991, 1992 Linus Torvalds
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/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
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* Wirzenius wrote this portably, Torvalds fucked it up :-)
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* Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
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* - changed to provide snprintf and vsnprintf functions
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#include "libc/string.h"
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#include "libc/vsprintf.h"
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static int skip_atoi(const char **s)
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i = i*10 + *((*s)++) - '0';
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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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__res = ((unsigned long long) n) % (unsigned) base; \
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n = ((unsigned long long) n) / (unsigned) base; \
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static int mstrlen( const char *str );
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#define PAGE_SIZE 4096
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static char * number(char * buf, char * end, long long num, int base, int size, int precision, int type)
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static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
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static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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digits = (type & LARGE) ? large_digits : small_digits;
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if (base < 2 || base > 36)
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c = (type & ZEROPAD) ? '0' : ' ';
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} else if (type & PLUS) {
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} else if (type & SPACE) {
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tmp[i++] = digits[do_div(num,base)];
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if (!(type&(ZEROPAD+LEFT))) {
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if (type & SPECIAL) {
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} else if (base==16) {
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if (!(type & LEFT)) {
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while (i < precision--) {
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* vsnprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @args: Arguments for the format string
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* Call this function if you are already dealing with a va_list.
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* You probably want snprintf instead.
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int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
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unsigned long long num;
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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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/* 'z' support added 23/7/1999 S.H. */
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/* 'z' changed to 'Z' --davidm 1/25/99 */
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end = buf + size - 1;
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size = end - buf + 1;
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for (; *fmt ; ++fmt) {
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++fmt; /* this also skips first '%' */
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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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/* get field width */
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field_width = skip_atoi(&fmt);
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else if (*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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/* get the precision */
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precision = skip_atoi(&fmt);
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else if (*fmt == '*') {
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/* it's the next argument */
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precision = va_arg(args, int);
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/* get the conversion qualifier */
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if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
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*fmt =='Z' || *fmt == 'z') {
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if (qualifier == 'l' && *fmt == 'l') {
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if (!(flags & LEFT)) {
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while (--field_width > 0) {
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c = (unsigned char) va_arg(args, int);
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while (--field_width > 0) {
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s = va_arg(args, char *);
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if ((unsigned long)s < PAGE_SIZE)
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len = strnlen(s, precision);
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if( precision > len )
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if (!(flags & LEFT)) {
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while (len < field_width--) {
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for (i = 0; i < len; ++i) {
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while (len < field_width--) {
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if (field_width == -1) {
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field_width = 2*sizeof(void *);
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str = number(str, end,
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(unsigned long) va_arg(args, void *),
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16, field_width, precision, flags);
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* What does C99 say about the overflow case here? */
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if (qualifier == 'l') {
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long * ip = va_arg(args, long *);
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} else if (qualifier == 'Z' || qualifier == 'z') {
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size_t * ip = va_arg(args, size_t *);
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int * ip = va_arg(args, int *);
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/* integer number formats - set up the flags and "break" */
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if (qualifier == 'L')
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num = va_arg(args, long long);
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else if (qualifier == 'l') {
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num = va_arg(args, unsigned long);
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num = (signed long) num;
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} else if (qualifier == 'Z' || qualifier == 'z') {
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num = va_arg(args, size_t);
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} else if (qualifier == 'h') {
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num = (unsigned short) va_arg(args, int);
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num = (signed short) num;
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num = va_arg(args, unsigned int);
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num = (signed int) num;
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str = number(str, end, num, base,
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field_width, precision, flags);
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/* don't write out a null byte if the buf size is zero */
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/* the trailing null byte doesn't count towards the total
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* snprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @...: Arguments for the format string
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int snprintf(char * buf, size_t size, const char *fmt, ...)
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i=vsnprintf(buf,size,fmt,args);
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* vsprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @fmt: The format string to use
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* @args: Arguments for the format string
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* Call this function if you are already dealing with a va_list.
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* You probably want sprintf instead.
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int vsprintf(char *buf, const char *fmt, va_list args)
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return vsnprintf(buf, (~0U)>>1, fmt, args);
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* sprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @fmt: The format string to use
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* @...: Arguments for the format string
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int sprintf(char * buf, const char *fmt, ...)
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i=vsprintf(buf,fmt,args);
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static int mstrlen( const char *str )