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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Printf-like functionality for Chrome EC */
#include "printf.h"
#include "timer.h"
#include "util.h"
static const char error_str[] = "ERROR";
int vfnprintf(int (*addchar)(void *context, int c), void *context,
const char *format, va_list args)
{
char intbuf[34];
/* Longest uint64 in decimal = 20
* longest uint32 in binary = 32
*/
int dropped_chars = 0;
int is_left;
int pad_zero;
int pad_width;
char *vstr;
int vlen;
while (*format && !dropped_chars) {
int c = *format++;
/* Copy normal characters */
if (c != '%') {
dropped_chars |= addchar(context, c);
continue;
}
/* Get first format character */
c = *format++;
/* Send "%" for "%%" input */
if (c == '%' || c == '\0') {
dropped_chars |= addchar(context, '%');
continue;
}
/* Handle %c */
if (c == 'c') {
c = va_arg(args, int);
dropped_chars |= addchar(context, c);
continue;
}
/* Handle left-justification ("%-5s") */
is_left = (c == '-');
if (is_left)
c = *format++;
/* Handle padding with 0's */
pad_zero = (c == '0');
if (pad_zero)
c = *format++;
/* Count padding length */
pad_width = 0;
while (c >= '0' && c <= '9') {
pad_width = (10 * pad_width) + c - '0';
c = *format++;
}
if (pad_width > 80) {
/* Sanity check for width failed */
format = error_str;
continue;
}
if (c == 's') {
vstr = va_arg(args, char *);
if (vstr == NULL)
vstr = "(NULL)";
} else {
uint64_t v;
int is_negative = 0;
int is_64bit = 0;
int base = 10;
int fixed_point = 0;
/* Handle fixed point numbers */
if (c == '.') {
c = *format++;
if (c < '0' || c > '9') {
format = error_str;
continue;
}
fixed_point = c - '0';
c = *format++;
}
if (c == 'l') {
is_64bit = 1;
c = *format++;
}
/* Special-case: %T = current time */
if (c == 'T') {
v = get_time().val;
is_64bit = 1;
fixed_point = 6;
} else if (is_64bit) {
v = va_arg(args, uint64_t);
} else {
v = va_arg(args, uint32_t);
}
switch (c) {
case 'd':
if (is_64bit) {
if ((int64_t)v < 0) {
is_negative = 1;
if (v != (1ULL << 63))
v = -v;
}
} else {
if ((int)v < 0) {
is_negative = 1;
if (v != (1ULL << 31))
v = -(int)v;
}
}
break;
case 'u':
case 'T':
break;
case 'X':
case 'x':
case 'p':
base = 16;
break;
case 'b':
base = 2;
break;
default:
format = error_str;
}
if (format == error_str)
continue; /* Bad format specifier */
/* Convert integer to string, starting at end of
* buffer and working backwards. */
vstr = intbuf + sizeof(intbuf) - 1;
*(vstr) = '\0';
/* Handle digits to right of decimal for fixed point
* numbers. */
for (vlen = 0; vlen < fixed_point; vlen++)
*(--vstr) = '0' + uint64divmod(&v, 10);
if (fixed_point)
*(--vstr) = '.';
if (!v)
*(--vstr) = '0';
while (v) {
int digit = uint64divmod(&v, base);
if (digit < 10)
*(--vstr) = '0' + digit;
else if (c == 'X')
*(--vstr) = 'A' + digit - 9;
else
*(--vstr) = 'a' + digit - 9;
}
if (is_negative)
*(--vstr) = '-';
}
/* Copy string (or stringified integer) */
vlen = strlen(vstr);
while (vlen < pad_width && !is_left) {
dropped_chars |= addchar(context, pad_zero ? '0' : ' ');
vlen++;
}
while (*vstr)
dropped_chars |= addchar(context, *vstr++);
while (vlen < pad_width && is_left) {
dropped_chars |= addchar(context, ' ');
vlen++;
}
}
/* Successful if we consumed all output */
return dropped_chars ? EC_ERROR_OVERFLOW : EC_SUCCESS;
}
/* Context for snprintf() */
struct snprintf_context {
char *str;
int size;
};
/* Add a character to the string */
static int snprintf_addchar(void *context, int c)
{
struct snprintf_context *ctx = (struct snprintf_context *)context;
if (!ctx->size)
return 1;
*(ctx->str++) = c;
ctx->size--;
return 0;
}
/* Print formatted outut to a string */
int snprintf(char *str, int size, const char *format, ...)
{
struct snprintf_context ctx;
va_list args;
int rv;
if (!str || !size)
return EC_ERROR_INVAL;
ctx.str = str;
ctx.size = size - 1; /* Reserve space for terminating '\0' */
va_start(args, format);
rv = vfnprintf(snprintf_addchar, &ctx, format, args);
va_end(args);
/* Terminate string */
*ctx.str = '\0';
return rv;
}
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