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/* sb_printf.c
* Minimal printf implementation that is designed to work without calling back
* into the C library or libsandbox. Goes straight to kernel so that this
* should be usable from anywhere. All state is on stack, so also avoids
* signal, threaded, and other fun async behavior.
*
* The following conversion specifiers are supported:
* c - character
* s - string
* d - integer
* i - integer
* u - unsigned integer
* X - HEX number
* x - hex number
* p - pointer
*
* The following modifiers are supported:
* z - size_t
* * - width is an argument
*
* Copyright 1999-2008 Gentoo Foundation
* Licensed under the GPL-2
*/
#include "headers.h"
#include "sbutil.h"
#define MOD_STAR (1 << 0)
#define MOD_SIZE_T (1 << 1)
#define MOD_LONG_T (1 << 2)
void sb_vfdprintf(int fd, const char *format, va_list args)
{
const char *fmt = format;
const char *format_end = format + strlen(format);
const char *conv = fmt;
while (fmt < format_end) {
conv = memchr(fmt, '%', format_end - fmt);
if (conv != fmt) {
size_t out_bytes = (conv ? conv : format_end) - fmt;
sb_write(fd, fmt, out_bytes);
if (!conv)
return;
}
char buf[50];
size_t idx;
unsigned int u, x;
char hex_base;
size_t padding = 0;
unsigned int modifiers = 0;
eat_more:
switch (conv[1]) {
default:
sb_fdprintf(fd, "{invalid conversion specifier in string: %s}", format);
break;
case '%':
if (modifiers) {
inv_modifier:
sb_fdprintf(fd, "{invalid modifier in string: %s}", format);
}
sb_write(fd, conv, 1);
break;
case 'l':
++conv;
if (modifiers & MOD_LONG_T)
goto inv_modifier;
modifiers |= MOD_LONG_T;
goto eat_more;
case 'z':
++conv;
if (modifiers & MOD_SIZE_T)
goto inv_modifier;
modifiers |= MOD_SIZE_T;
goto eat_more;
case '*':
++conv;
if (modifiers & MOD_STAR)
goto inv_modifier;
modifiers |= MOD_STAR;
padding = va_arg(args, int);
goto eat_more;
case 'c': {
char c = va_arg(args, int);
sb_write(fd, &c, 1);
break;
}
case 's': {
char *s = va_arg(args, char *);
if (!s)
s = "(null)";
size_t len = strlen(s);
while (len < padding--)
sb_write(fd, " ", 1);
sb_write(fd, s, len);
break;
}
case 'd':
case 'i': {
long i;
if (modifiers & MOD_SIZE_T)
i = va_arg(args, ssize_t);
else if (modifiers & MOD_LONG_T)
i = va_arg(args, long);
else
i = va_arg(args, int);
u = i;
if (i < 0) {
sb_write(fd, "-", 1);
u = i * -1;
}
out_uint:
idx = 0;
do {
buf[idx++] = '0' + (u % 10);
} while (u /= 10);
while (idx--)
sb_write(fd, buf+idx, 1);
break;
}
case 'u': {
u = va_arg(args, unsigned int);
goto out_uint;
break;
}
case 'X': {
hex_base = 'A';
goto out_hex;
}
case 'x': {
hex_base = 'a';
out_hex:
if (modifiers & MOD_SIZE_T)
x = va_arg(args, size_t);
else
x = va_arg(args, unsigned int);
out_ptr:
idx = 0;
do {
u = x % 16;
buf[idx++] = (u < 10 ? '0' + u : hex_base + u - 10);
} while (x /= 16);
while (idx < padding)
buf[idx++] = '0';
buf[idx++] = 'x';
buf[idx++] = '0';
while (idx--)
sb_write(fd, buf+idx, 1);
break;
}
case 'p': {
void *p = va_arg(args, void *);
hex_base = 'a';
padding = sizeof(p) * 2;
x = (unsigned long)p;
goto out_ptr;
}
}
fmt = conv + 2;
}
}
void sb_fdprintf(int fd, const char *format, ...)
{
va_list args;
va_start(args, format);
sb_vfdprintf(fd, format, args);
va_end(args);
}
/* All output goes to stderr as any unexpected interjection into stdout
* could easily break shell scripts and such that are piping or evaluating
* or some such thing.
*/
void sb_printf(const char *format, ...)
{
va_list args;
va_start(args, format);
sb_vfdprintf(STDERR_FILENO, format, args);
va_end(args);
}
static bool nocolor, init_color = false;
void sb_efunc(const char *color, const char *hilight, const char *format, ...)
{
save_errno();
int fd = STDERR_FILENO;
if (!init_color) {
nocolor = is_env_on(ENV_NOCOLOR);
init_color = true;
}
if (!nocolor)
sb_fdprintf(fd, "%s%s%s", color, hilight, COLOR_NORMAL);
else
sb_fdprintf(fd, "%s", hilight);
va_list args;
va_start(args, format);
sb_vfdprintf(fd, format, args);
va_end(args);
restore_errno();
}
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