/* | |
Copyright 2001, 2002 Georges Menie (www.menie.org) | |
stdarg version contributed by Christian Ettinger | |
This program is free software; you can redistribute it and/or modify | |
it under the terms of the GNU Lesser General Public License as published by | |
the Free Software Foundation; either version 2 of the License, or | |
(at your option) any later version. | |
This program is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
GNU Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public License | |
along with this program; if not, write to the Free Software | |
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
*/ | |
/* | |
putchar is the only external dependency for this file, | |
if you have a working putchar, leave it commented out. | |
If not, uncomment the define below and | |
replace outbyte(c) by your own function call. | |
*/ | |
#define putchar(c) c | |
#include <stdarg.h> | |
static void printchar(char **str, int c) | |
{ | |
//extern int putchar(int c); | |
if (str) { | |
**str = (char)c; | |
++(*str); | |
} | |
else | |
{ | |
(void)putchar(c); | |
} | |
} | |
#define PAD_RIGHT 1 | |
#define PAD_ZERO 2 | |
static int prints(char **out, const char *string, int width, int pad) | |
{ | |
register int pc = 0, padchar = ' '; | |
if (width > 0) { | |
register int len = 0; | |
register const char *ptr; | |
for (ptr = string; *ptr; ++ptr) ++len; | |
if (len >= width) width = 0; | |
else width -= len; | |
if (pad & PAD_ZERO) padchar = '0'; | |
} | |
if (!(pad & PAD_RIGHT)) { | |
for ( ; width > 0; --width) { | |
printchar (out, padchar); | |
++pc; | |
} | |
} | |
for ( ; *string ; ++string) { | |
printchar (out, *string); | |
++pc; | |
} | |
for ( ; width > 0; --width) { | |
printchar (out, padchar); | |
++pc; | |
} | |
return pc; | |
} | |
/* the following should be enough for 32 bit int */ | |
#define PRINT_BUF_LEN 12 | |
static int printi(char **out, int i, int b, int sg, int width, int pad, int letbase) | |
{ | |
char print_buf[PRINT_BUF_LEN]; | |
register char *s; | |
register int t, neg = 0, pc = 0; | |
register unsigned int u = (unsigned int)i; | |
if (i == 0) { | |
print_buf[0] = '0'; | |
print_buf[1] = '\0'; | |
return prints (out, print_buf, width, pad); | |
} | |
if (sg && b == 10 && i < 0) { | |
neg = 1; | |
u = (unsigned int)-i; | |
} | |
s = print_buf + PRINT_BUF_LEN-1; | |
*s = '\0'; | |
while (u) { | |
t = (unsigned int)u % b; | |
if( t >= 10 ) | |
t += letbase - '0' - 10; | |
*--s = (char)(t + '0'); | |
u /= b; | |
} | |
if (neg) { | |
if( width && (pad & PAD_ZERO) ) { | |
printchar (out, '-'); | |
++pc; | |
--width; | |
} | |
else { | |
*--s = '-'; | |
} | |
} | |
return pc + prints (out, s, width, pad); | |
} | |
static int print( char **out, const char *format, va_list args ) | |
{ | |
register int width, pad; | |
register int pc = 0; | |
char scr[2]; | |
for (; *format != 0; ++format) { | |
if (*format == '%') { | |
++format; | |
width = pad = 0; | |
if (*format == '\0') break; | |
if (*format == '%') goto out; | |
if (*format == '-') { | |
++format; | |
pad = PAD_RIGHT; | |
} | |
while (*format == '0') { | |
++format; | |
pad |= PAD_ZERO; | |
} | |
for ( ; *format >= '0' && *format <= '9'; ++format) { | |
width *= 10; | |
width += *format - '0'; | |
} | |
if( *format == 's' ) { | |
register char *s = (char *)va_arg( args, int ); | |
pc += prints (out, s?s:"(null)", width, pad); | |
continue; | |
} | |
if( *format == 'd' ) { | |
pc += printi (out, va_arg( args, int ), 10, 1, width, pad, 'a'); | |
continue; | |
} | |
if( *format == 'x' ) { | |
pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'a'); | |
continue; | |
} | |
if( *format == 'X' ) { | |
pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'A'); | |
continue; | |
} | |
if( *format == 'u' ) { | |
pc += printi (out, va_arg( args, int ), 10, 0, width, pad, 'a'); | |
continue; | |
} | |
if( *format == 'c' ) { | |
/* char are converted to int then pushed on the stack */ | |
scr[0] = (char)va_arg( args, int ); | |
scr[1] = '\0'; | |
pc += prints (out, scr, width, pad); | |
continue; | |
} | |
} | |
else { | |
out: | |
printchar (out, *format); | |
++pc; | |
} | |
} | |
if (out) **out = '\0'; | |
va_end( args ); | |
return pc; | |
} | |
int printf(const char *format, ...) | |
{ | |
va_list args; | |
va_start( args, format ); | |
return print( 0, format, args ); | |
} | |
int sprintf(char *out, const char *format, ...) | |
{ | |
va_list args; | |
va_start( args, format ); | |
return print( &out, format, args ); | |
} | |
int snprintf( char *buf, unsigned int count, const char *format, ... ) | |
{ | |
va_list args; | |
( void ) count; | |
va_start( args, format ); | |
return print( &buf, format, args ); | |
} | |
#ifdef TEST_PRINTF | |
int main(void) | |
{ | |
char *ptr = "Hello world!"; | |
char *np = 0; | |
int i = 5; | |
unsigned int bs = sizeof(int)*8; | |
int mi; | |
char buf[80]; | |
mi = (1 << (bs-1)) + 1; | |
printf("%s\n", ptr); | |
printf("printf test\n"); | |
printf("%s is null pointer\n", np); | |
printf("%d = 5\n", i); | |
printf("%d = - max int\n", mi); | |
printf("char %c = 'a'\n", 'a'); | |
printf("hex %x = ff\n", 0xff); | |
printf("hex %02x = 00\n", 0); | |
printf("signed %d = unsigned %u = hex %x\n", -3, -3, -3); | |
printf("%d %s(s)%", 0, "message"); | |
printf("\n"); | |
printf("%d %s(s) with %%\n", 0, "message"); | |
sprintf(buf, "justif: \"%-10s\"\n", "left"); printf("%s", buf); | |
sprintf(buf, "justif: \"%10s\"\n", "right"); printf("%s", buf); | |
sprintf(buf, " 3: %04d zero padded\n", 3); printf("%s", buf); | |
sprintf(buf, " 3: %-4d left justif.\n", 3); printf("%s", buf); | |
sprintf(buf, " 3: %4d right justif.\n", 3); printf("%s", buf); | |
sprintf(buf, "-3: %04d zero padded\n", -3); printf("%s", buf); | |
sprintf(buf, "-3: %-4d left justif.\n", -3); printf("%s", buf); | |
sprintf(buf, "-3: %4d right justif.\n", -3); printf("%s", buf); | |
return 0; | |
} | |
/* | |
* if you compile this file with | |
* gcc -Wall $(YOUR_C_OPTIONS) -DTEST_PRINTF -c printf.c | |
* you will get a normal warning: | |
* printf.c:214: warning: spurious trailing `%' in format | |
* this line is testing an invalid % at the end of the format string. | |
* | |
* this should display (on 32bit int machine) : | |
* | |
* Hello world! | |
* printf test | |
* (null) is null pointer | |
* 5 = 5 | |
* -2147483647 = - max int | |
* char a = 'a' | |
* hex ff = ff | |
* hex 00 = 00 | |
* signed -3 = unsigned 4294967293 = hex fffffffd | |
* 0 message(s) | |
* 0 message(s) with % | |
* justif: "left " | |
* justif: " right" | |
* 3: 0003 zero padded | |
* 3: 3 left justif. | |
* 3: 3 right justif. | |
* -3: -003 zero padded | |
* -3: -3 left justif. | |
* -3: -3 right justif. | |
*/ | |
#endif | |
/* To keep linker happy. */ | |
int __write( int i, char* c, int n) | |
{ | |
(void)i; | |
(void)n; | |
(void)c; | |
return 0; | |
} | |