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Fix precedence of printf flags

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This commit is contained in:
Renaud 2021-06-14 15:51:46 +08:00
parent 77253914e1
commit d2836ddd55
1 changed files with 54 additions and 46 deletions
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100
printf.c
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@ -17,9 +17,8 @@ size_t strlen( const char *s) {
return end - s ;
}
#define ZEROPAD (1 << 3)
#define LEFTALIGN (3 << 2)
#define LEFTMASK 4
#define LEFTALIGN (1 << 3)
#define ZEROPAD (1 << 2)
#define PLUSSIGN (1 << 1)
#define BLANKSIGN (1 << 0)
@ -41,52 +40,62 @@ static int kputpad( char c, int len) {
kputc( c) ;
} else
cnt = 0 ;
return cnt ;
}
static int kputwidth( char *s, int left_aligned, int width) {
int cnt = left_aligned ? 0 : kputpad( ' ', width - strlen( s)) ;
int size = kputs( s) ;
cnt += size ;
if( left_aligned)
cnt += kputpad( ' ', width - size) ;
return cnt ;
}
static int kputu( unsigned u, int padlen, char fmt) {
char s[ 12] ; /* room for 11 octal digit + EOS */
static int kputu( unsigned u, int flags, int width, char fmt) {
#define MAXDIGITS 11
char s[ MAXDIGITS + 1] ; /* room for 11 octal digit + EOS */
/* octal 37777777777, decimal -2147483647 */
char *p = &s[ sizeof s - 1] ; /* point to last byte */
char signprefix ;
*p = 0 ; /* null terminated string */
int flags = padlen >> 28 ;
padlen &= 0x0FFFFFFF ; /* clear flags */
if( fmt == 'i' && (0 > (int) u)) {
if( fmt != 'i')
/* ouxX (d has been converted to i) */
signprefix = 0 ;
else if( 0 > (int) u) {
u = - (int) u ;
signprefix = '-' ;
} else
signprefix = signs[ flags & 3] ;
if( signprefix)
padlen -= 1 ;
unsigned d = base[ fmt & 3] ;
fmt = fmt & 0x20 ; /* set uppercase bit */
do {
*--p = "0123456789ABCDEF"[ u % d] | fmt ;
padlen -= 1 ;
u /= d ;
} while( u) ;
/* reuse u to calculate output length */
flags >>= 2 ;
if( !flags) /* Right align */
u += kputpad( ' ', padlen) ;
if( signprefix)
*--p = signprefix ;
if( signprefix) {
kputc( signprefix) ;
u += 1 ;
}
int size = MAXDIGITS - (p - s) ; /* string length */
/* reuse u to return output length */
if( width <= size)
u = kputs( p) ;
else if( (flags & 0x0C) == ZEROPAD) { /* LEFTALIGN precedence over ZEROPAD */
/* handle zero padding */
if( signprefix)
kputc( *p++) ;
if( flags == (ZEROPAD >> 2))
u += kputpad( '0', padlen) ;
u += kputs( p) ;
if( flags == (LEFTALIGN >> 2))
u += kputpad( ' ', padlen) ;
kputpad( '0', width - size) ;
kputs( p) ;
u = width ;
} else
/* handle left and right alignment */
u = kputwidth( p, flags >> 3, width) ;
return u ;
}
@ -95,6 +104,7 @@ int printf( const char *fmt, ...) {
va_list ap ;
int cnt = 0 ;
int c ; /* current char in format string */
char *sp ;
va_start( ap, fmt) ;
while( ( c = *fmt++) != 0)
@ -141,13 +151,14 @@ int printf( const char *fmt, ...) {
switch( c) {
case 'c':
flags >>= 2 ;
if( !flags) /* right aligned */
cnt += kputpad( ' ', width - 1) ;
cnt += 1 ; kputc( va_arg( ap, int /* char */)) ;
if( flags == (LEFTALIGN >> 2))
cnt += kputpad( ' ', width - 1) ;
c = va_arg( ap, int) ;
if( width > 1) {
/* handle left and right alignment */
sp = (char *) &c ;
goto s_width ;
} else {
cnt += 1 ; kputc( c) ;
}
break ;
case 'd':
@ -158,19 +169,16 @@ int printf( const char *fmt, ...) {
case 'u':
case 'x':
case 'X':
cnt += kputu( va_arg( ap, unsigned), width | flags << 28, c) ;
cnt += kputu( va_arg( ap, unsigned), flags, width, c) ;
break ;
case 's': {
char *argp = va_arg( ap, char *) ;
flags >>= 2 ;
if( !flags) /* right aligned */
cnt += kputpad( ' ', width - strlen( argp)) ;
int size = kputs( argp) ;
cnt += size ;
if( flags == (LEFTMASK >> 2))
cnt += kputpad( ' ', width - size) ;
}
case 's':
sp = va_arg( ap, char *) ;
if( width)
/* handle left and right alignment */
s_width:
cnt += kputwidth( sp, flags >> 3, width) ;
else
cnt += kputs( sp) ;
break ;
default: