ahp/busybox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ash: optional printf builtin. +25 bytes if off, +35 if on.

Browse source 
by Cristian Ionescu-Idbohrn.
This commit is contained in:
Denis Vlasenko 2008-06-01 22:36:39 +00:00
parent d78920675f
commit cd2663f15e
9 changed files with 45 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

18
coreutils/printf.c
View file

@ -193,6 +193,7 @@ static char **print_formatted(char *f, char **argv)
unsigned direc_length; /* Length of % directive. */
int field_width; /* Arg to first '*', or -1 if none. */
int precision; /* Arg to second '*', or -1 if none. */
char **saved_argv = argv;
for (; *f; ++f) {
switch (*f) {
@ -264,8 +265,9 @@ static char **print_formatted(char *f, char **argv)
precision, "");
break;
case '\\':
if (*++f == 'c')
exit(EXIT_SUCCESS);
if (*++f == 'c') {
return saved_argv; /* causes main() to exit */
}
bb_putchar(bb_process_escape_sequence((const char **)&f));
f--;
break;
@ -277,12 +279,22 @@ static char **print_formatted(char *f, char **argv)
return argv;
}
int printf_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int printf_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
char *format;
char **argv2;
/* We must check that stdout is not closed.
* The reason for this is highly non-obvious. printf_main is used from shell.
* Shell must correctly handle 'printf "%s" foo'
* if stdout is closed. With stdio, output gets shoveled into
* stdout buffer, and even fflush cannot clear it out. It seems that
* even if libc receives EBADF on write attempts, it feels determined
* to output data no matter what. So it will try later,
* and possibly will clobber future output. Not good. */
if (dup2(1, 1) != 1)
return -1;
/* bash builtin errors out on "printf '-%s-\n' foo",
* coreutils-6.9 works. Both work with "printf -- '-%s-\n' foo".
* We will mimic coreutils. */