314 lines
6.5 KiB
C
314 lines
6.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/* printf - format and print data
|
|
|
|
Copyright 1999 Dave Cinege
|
|
Portions copyright (C) 1990-1996 Free Software Foundation, Inc.
|
|
|
|
Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
/* Usage: printf format [argument...]
|
|
|
|
A front end to the printf function that lets it be used from the shell.
|
|
|
|
Backslash escapes:
|
|
|
|
\" = double quote
|
|
\\ = backslash
|
|
\a = alert (bell)
|
|
\b = backspace
|
|
\c = produce no further output
|
|
\f = form feed
|
|
\n = new line
|
|
\r = carriage return
|
|
\t = horizontal tab
|
|
\v = vertical tab
|
|
\0ooo = octal number (ooo is 0 to 3 digits)
|
|
\xhhh = hexadecimal number (hhh is 1 to 3 digits)
|
|
|
|
Additional directive:
|
|
|
|
%b = print an argument string, interpreting backslash escapes
|
|
|
|
The 'format' argument is re-used as many times as necessary
|
|
to convert all of the given arguments.
|
|
|
|
David MacKenzie <djm@gnu.ai.mit.edu> */
|
|
|
|
|
|
// 19990508 Busy Boxed! Dave Cinege
|
|
|
|
#include "libbb.h"
|
|
|
|
typedef void (*converter)(const char *arg, void *result);
|
|
|
|
static void multiconvert(const char *arg, void *result, converter convert)
|
|
{
|
|
char s[sizeof(int)*3 + 2];
|
|
|
|
if (*arg == '"' || *arg == '\'') {
|
|
sprintf(s, "%d", (unsigned char)arg[1]);
|
|
arg = s;
|
|
}
|
|
convert(arg, result);
|
|
/* if there was conversion error, print unconverted string */
|
|
if (errno)
|
|
fputs(arg, stderr);
|
|
}
|
|
|
|
static void conv_strtoul(const char *arg, void *result)
|
|
{
|
|
*(unsigned long*)result = bb_strtoul(arg, NULL, 0);
|
|
}
|
|
static void conv_strtol(const char *arg, void *result)
|
|
{
|
|
*(long*)result = bb_strtol(arg, NULL, 0);
|
|
}
|
|
static void conv_strtod(const char *arg, void *result)
|
|
{
|
|
char *end;
|
|
/* Well, this one allows leading whitespace... so what */
|
|
/* What I like much less is that "-" is accepted too! :( */
|
|
*(double*)result = strtod(arg, &end);
|
|
if (end[0]) errno = ERANGE;
|
|
}
|
|
|
|
static unsigned long my_xstrtoul(const char *arg)
|
|
{
|
|
unsigned long result;
|
|
multiconvert(arg, &result, conv_strtoul);
|
|
return result;
|
|
}
|
|
|
|
static long my_xstrtol(const char *arg)
|
|
{
|
|
long result;
|
|
multiconvert(arg, &result, conv_strtol);
|
|
return result;
|
|
}
|
|
|
|
static double my_xstrtod(const char *arg)
|
|
{
|
|
double result;
|
|
multiconvert(arg, &result, conv_strtod);
|
|
return result;
|
|
}
|
|
|
|
static void print_esc_string(char *str)
|
|
{
|
|
for (; *str; str++) {
|
|
if (*str == '\\') {
|
|
str++;
|
|
bb_putchar(bb_process_escape_sequence((const char **)&str));
|
|
} else {
|
|
bb_putchar(*str);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
static void print_direc(char *start, size_t length, int field_width, int precision,
|
|
const char *argument)
|
|
{
|
|
char *p; /* Null-terminated copy of % directive. */
|
|
|
|
p = xmalloc((unsigned) (length + 1));
|
|
strncpy(p, start, length);
|
|
p[length] = 0;
|
|
|
|
switch (p[length - 1]) {
|
|
case 'd':
|
|
case 'i':
|
|
if (field_width < 0) {
|
|
if (precision < 0)
|
|
printf(p, my_xstrtol(argument));
|
|
else
|
|
printf(p, precision, my_xstrtol(argument));
|
|
} else {
|
|
if (precision < 0)
|
|
printf(p, field_width, my_xstrtol(argument));
|
|
else
|
|
printf(p, field_width, precision, my_xstrtol(argument));
|
|
}
|
|
break;
|
|
case 'o':
|
|
case 'u':
|
|
case 'x':
|
|
case 'X':
|
|
if (field_width < 0) {
|
|
if (precision < 0)
|
|
printf(p, my_xstrtoul(argument));
|
|
else
|
|
printf(p, precision, my_xstrtoul(argument));
|
|
} else {
|
|
if (precision < 0)
|
|
printf(p, field_width, my_xstrtoul(argument));
|
|
else
|
|
printf(p, field_width, precision, my_xstrtoul(argument));
|
|
}
|
|
break;
|
|
case 'f':
|
|
case 'e':
|
|
case 'E':
|
|
case 'g':
|
|
case 'G':
|
|
if (field_width < 0) {
|
|
if (precision < 0)
|
|
printf(p, my_xstrtod(argument));
|
|
else
|
|
printf(p, precision, my_xstrtod(argument));
|
|
} else {
|
|
if (precision < 0)
|
|
printf(p, field_width, my_xstrtod(argument));
|
|
else
|
|
printf(p, field_width, precision, my_xstrtod(argument));
|
|
}
|
|
break;
|
|
case 'c':
|
|
printf(p, *argument);
|
|
break;
|
|
case 's':
|
|
if (field_width < 0) {
|
|
if (precision < 0)
|
|
printf(p, argument);
|
|
else
|
|
printf(p, precision, argument);
|
|
} else {
|
|
if (precision < 0)
|
|
printf(p, field_width, argument);
|
|
else
|
|
printf(p, field_width, precision, argument);
|
|
}
|
|
break;
|
|
}
|
|
|
|
free(p);
|
|
}
|
|
|
|
/* Print the text in FORMAT, using ARGV (with ARGC elements) for
|
|
arguments to any '%' directives.
|
|
Return the number of elements of ARGV used. */
|
|
|
|
static int print_formatted(char *format, int argc, char **argv)
|
|
{
|
|
int save_argc = argc; /* Preserve original value. */
|
|
char *f; /* Pointer into 'format'. */
|
|
char *direc_start; /* Start of % directive. */
|
|
size_t direc_length; /* Length of % directive. */
|
|
int field_width; /* Arg to first '*', or -1 if none. */
|
|
int precision; /* Arg to second '*', or -1 if none. */
|
|
|
|
for (f = format; *f; ++f) {
|
|
switch (*f) {
|
|
case '%':
|
|
direc_start = f++;
|
|
direc_length = 1;
|
|
field_width = precision = -1;
|
|
if (*f == '%') {
|
|
bb_putchar('%');
|
|
break;
|
|
}
|
|
if (*f == 'b') {
|
|
if (argc > 0) {
|
|
print_esc_string(*argv);
|
|
++argv;
|
|
--argc;
|
|
}
|
|
break;
|
|
}
|
|
if (strchr("-+ #", *f)) {
|
|
++f;
|
|
++direc_length;
|
|
}
|
|
if (*f == '*') {
|
|
++f;
|
|
++direc_length;
|
|
if (argc > 0) {
|
|
field_width = my_xstrtoul(*argv);
|
|
++argv;
|
|
--argc;
|
|
} else
|
|
field_width = 0;
|
|
} else {
|
|
while (isdigit(*f)) {
|
|
++f;
|
|
++direc_length;
|
|
}
|
|
}
|
|
if (*f == '.') {
|
|
++f;
|
|
++direc_length;
|
|
if (*f == '*') {
|
|
++f;
|
|
++direc_length;
|
|
if (argc > 0) {
|
|
precision = my_xstrtoul(*argv);
|
|
++argv;
|
|
--argc;
|
|
} else
|
|
precision = 0;
|
|
} else
|
|
while (isdigit(*f)) {
|
|
++f;
|
|
++direc_length;
|
|
}
|
|
}
|
|
if (*f == 'l' || *f == 'L' || *f == 'h') {
|
|
++f;
|
|
++direc_length;
|
|
}
|
|
/*
|
|
if (!strchr ("diouxXfeEgGcs", *f))
|
|
fprintf(stderr, "%%%c: invalid directive", *f);
|
|
*/
|
|
++direc_length;
|
|
if (argc > 0) {
|
|
print_direc(direc_start, direc_length, field_width,
|
|
precision, *argv);
|
|
++argv;
|
|
--argc;
|
|
} else
|
|
print_direc(direc_start, direc_length, field_width,
|
|
precision, "");
|
|
break;
|
|
case '\\':
|
|
if (*++f == 'c')
|
|
exit(0);
|
|
bb_putchar(bb_process_escape_sequence((const char **)&f));
|
|
f--;
|
|
break;
|
|
default:
|
|
bb_putchar(*f);
|
|
}
|
|
}
|
|
|
|
return save_argc - argc;
|
|
}
|
|
|
|
int printf_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int printf_main(int argc, char **argv)
|
|
{
|
|
char *format;
|
|
int args_used;
|
|
|
|
if (argc <= 1 || argv[1][0] == '-') {
|
|
bb_show_usage();
|
|
}
|
|
|
|
format = argv[1];
|
|
argc -= 2;
|
|
argv += 2;
|
|
|
|
do {
|
|
args_used = print_formatted(format, argc, argv);
|
|
argc -= args_used;
|
|
argv += args_used;
|
|
} while (args_used > 0 && argc > 0);
|
|
|
|
/* if (argc > 0)
|
|
fprintf(stderr, "excess args ignored");
|
|
*/
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|