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/* printf.c - Format and Print the data.
*
* Copyright 2014 Sandeep Sharma <sandeep.jack2756@gmail.com>
* Copyright 2014 Kyungwan Han <asura321@gmail.com>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/printf.html
USE_PRINTF(NEWTOY(printf, "<1", TOYFLAG_USR|TOYFLAG_BIN))
config PRINTF
bool "printf"
default n
help
usage: printf FORMAT [ARGUMENT...]
Format and print ARGUMENT(s) according to FORMAT, using C printf syntax
(percent escapes for cdeEfgGiosuxX, slash escapes for \abefnrtv0 or
\0OCT or 0xHEX).
*/
#define FOR_printf
#include "toys.h"
GLOBALS(
char *hv_w;
char *hv_p;
int encountered;
)
// Detect matching character (return true/valse) and advance pointer if match.
static int eat(char **s, char c)
{
int x = (**s == c);
if (x) ++*s;
return x;
}
// Add ll and L to Interger and floating point formats respectively.
static char *get_format(char *f)
{
int len = strlen(f);
char last = f[--len], *post = "";
f[len] = 0;
if (strchr("diouxX", last)) post = "ll"; // add ll to integer modifier.
else if (strchr("feEgG", last)) post = "L"; // add L to float modifier.
return xmprintf("%s%s%c", f, post, last);
}
// Print arguments with corresponding conversion and width and precision.
static void print(char *fmt, int w, int p)
{
char *ptr = fmt, *ep = 0, *format = 0, *arg = *toys.optargs;
errno = 0;
if (strchr("diouxX", *ptr)) {
long long val = 0;
if (arg) {
if (*arg == '\'' || *arg == '"') val = arg[1];
else {
val = strtoll(arg, &ep, 0);
if (errno || (ep && (*ep || ep == arg))) {
perror_msg("Invalid num %s", arg);
val = 0;
}
}
}
format = get_format(fmt);
TT.hv_w ? (TT.hv_p ? printf(format, w, p, val) : printf(format, w, val))
: (TT.hv_p ? printf(format, p, val) : printf(format, val));
} else if (strchr("gGeEf", *ptr)) {
long double dval = 0;
if (arg) {
dval = strtold(arg, &ep);
if (errno || (ep && (*ep || ep == arg))) {
perror_msg("Invalid num %s", arg);
dval = 0;
}
}
format = get_format(fmt);
TT.hv_w ? (TT.hv_p ? printf(format, w, p, dval) : printf(format, w, dval))
: (TT.hv_p ? printf(format, p, dval) : printf(format, dval));
} else if (*ptr == 's') {
char *str = arg;
if (!str) str = "";
TT.hv_w ? (TT.hv_p ? printf(fmt,w,p,str): printf(fmt, w, str))
: (TT.hv_p ? printf(fmt, p, str) : printf(fmt, str));
} else if (*ptr == 'c') printf(fmt, arg ? *arg : 0);
if (format) free(format);
}
// Parse escape sequences.
static int handle_slash(char **esc_val)
{
char *ptr = *esc_val;
int len = 1, base = 0;
unsigned result = 0;
if (*ptr == 'c') xexit();
// 0x12 hex escapes have 1-2 digits, \123 octal escapes have 1-3 digits.
if (eat(&ptr, 'x')) base = 16;
else if (*ptr >= '0' && *ptr <= '8') base = 8;
len += (base-8)/8;
// Not a hex or octal escape? (This catches trailing \)
if (!len) {
if (!(result = unescape(*ptr))) result = '\\';
else ++*esc_val;
return result;
}
while (len) {
unsigned num = tolower(*ptr)-'0';
if (num > 10) num += '0'-'a'+10;
if (num >= base) {
// Don't parse invalid hex value ala "\xvd", print it verbatim
if (base == 16 && len == 2) {
ptr--;
result = '\\';
}
break;
}
result = (result*base)+num;
ptr++;
len--;
}
*esc_val = ptr;
return (char)result;
}
void printf_main(void)
{
char *format = *toys.optargs, **arg = toys.optargs+1, *f, *p;
for (f = format; *f; f++) {
if (eat(&f, '\\')) putchar(handle_slash(&f));
else if (*f != '%' || *++f == '%') xputc(*f);
else if (*f == 'b')
for (p = *arg ? *(arg++) : ""; *p; p++)
putchar(eat(&p, '\\') ? handle_slash(&p) : *p);
else {
char *start = f;
int wp[2], i;
// todo: we currently ignore these?
if (strchr("-+# ", *f)) f++;
memset(wp, 0, 8);
for (i=0; i<2; i++) {
if (eat(&f, '*')) {
if (*arg) wp[i] = atolx(*(arg++));
} else while (isdigit(*f)) f++;
if (!eat(&f, '.')) break;
}
if (!(p = strchr("diouxXfeEgGcs", *f)))
perror_exit("bad format@%ld", f-format);
else {
int len = f-start;
TT.hv_p = strstr(start, ".*");
TT.hv_w = strchr(start, '*');
//pitfall: handle diff b/w * and .*
if ((TT.hv_w-1) == TT.hv_p) TT.hv_w = NULL;
memcpy((p = xzalloc(len+1)), start, len);
print(p+len-1, wp[0], wp[1]);
if (*arg) arg++;
free(p);
p = NULL;
}
TT.encountered = 1;
}
}
}
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