busybox/libbb/printable_string.c
Denys Vlasenko e52da5570e libbb: auto_string() for efficient handling of temporary malloced stirngs
Use it in libiproute: get rid of one static string buffer.

function                                             old     new   delta
auto_string                                            -      51     +51
ll_index_to_name                                      10      49     +39
buffer_fill_and_print                                169     178      +9
scan_recursive                                       378     380      +2
decode_one_format                                    732     734      +2
cmdputs                                              334     332      -2
static.cur_saved                                       4       1      -3
static.nbuf                                           16       -     -16
printable_string                                      94      57     -37
ll_idx_n2a                                            53       -     -53
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 4/3 up/down: 103/-111)           Total: -8 bytes
   text	   data	    bss	    dec	    hex	filename
 939880	    992	  17496	 958368	  e9fa0	busybox_old
 939880	    992	  17480	 958352	  e9f90	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-09 17:59:56 +02:00

58 lines
1.0 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Unicode support routines.
*
* Copyright (C) 2010 Denys Vlasenko
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
#include "libbb.h"
#include "unicode.h"
const char* FAST_FUNC printable_string(uni_stat_t *stats, const char *str)
{
char *dst;
const char *s;
s = str;
while (1) {
unsigned char c = *s;
if (c == '\0') {
/* 99+% of inputs do not need conversion */
if (stats) {
stats->byte_count = (s - str);
stats->unicode_count = (s - str);
stats->unicode_width = (s - str);
}
return str;
}
if (c < ' ')
break;
if (c >= 0x7f)
break;
s++;
}
#if ENABLE_UNICODE_SUPPORT
dst = unicode_conv_to_printable(stats, str);
#else
{
char *d = dst = xstrdup(str);
while (1) {
unsigned char c = *d;
if (c == '\0')
break;
if (c < ' ' || c >= 0x7f)
*d = '?';
d++;
}
if (stats) {
stats->byte_count = (d - dst);
stats->unicode_count = (d - dst);
stats->unicode_width = (d - dst);
}
}
#endif
return auto_string(dst);
}