/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
** Portable safe sprintf code.
**
** Author: Kipp E.B. Hickman
*/
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include "primpl.h"
#include "prprf.h"
#include "prlong.h"
#include "prlog.h"
#include "prmem.h"
#if defined(_MSC_VER) && _MSC_VER <
1900
# define snprintf _snprintf
#endif
/*
** WARNING: This code may *NOT* call PR_LOG (because PR_LOG calls it)
*/
/*
** XXX This needs to be internationalized!
*/
typedef struct SprintfStateStr SprintfState;
struct SprintfStateStr {
int (*stuff)(SprintfState* ss,
const char* sp, PRUint32 len);
char* base;
char* cur;
PRUint32 maxlen;
/* Must not exceed PR_INT32_MAX. */
int (*func)(
void* arg,
const char* sp, PRUint32 len);
void* arg;
};
/*
** Numbered Argument
*/
struct NumArg {
int type;
/* type of the numbered argument */
union {
/* the numbered argument */
int i;
unsigned int ui;
PRInt32 i32;
PRUint32 ui32;
PRInt64 ll;
PRUint64 ull;
double d;
const char* s;
int* ip;
#ifdef WIN32
const WCHAR* ws;
#endif
} u;
};
#define NAS_DEFAULT_NUM
20 /* default number of NumberedArgument array */
/*
** For numeric types, the signed versions must have even values,
** and their corresponding unsigned versions must have the subsequent
** odd value.
*/
#define TYPE_INT16
0
#define TYPE_UINT16
1
#define TYPE_INTN
2
#define TYPE_UINTN
3
#define TYPE_INT32
4
#define TYPE_UINT32
5
#define TYPE_INT64
6
#define TYPE_UINT64
7
#define TYPE_STRING
8
#define TYPE_DOUBLE
9
#define TYPE_INTSTR
10
#ifdef WIN32
# define TYPE_WSTRING
11
#endif
#define TYPE_UNKNOWN
20
#define FLAG_LEFT
0x1
#define FLAG_SIGNED
0x2
#define FLAG_SPACED
0x4
#define FLAG_ZEROS
0x8
#define FLAG_NEG
0x10
/*
** Fill into the buffer using the data in src
*/
static int fill2(SprintfState* ss,
const char* src,
int srclen,
int width,
int flags) {
char space =
' ';
int rv;
width -= srclen;
if ((width >
0) && ((flags & FLAG_LEFT) ==
0)) {
/* Right adjusting */
if (flags & FLAG_ZEROS) {
space =
'0';
}
while (--width >=
0) {
rv = (*ss->stuff)(ss, &space,
1);
if (rv <
0) {
return rv;
}
}
}
/* Copy out the source data */
rv = (*ss->stuff)(ss, src, srclen);
if (rv <
0) {
return rv;
}
if ((width >
0) && ((flags & FLAG_LEFT) !=
0)) {
/* Left adjusting */
while (--width >=
0) {
rv = (*ss->stuff)(ss, &space,
1);
if (rv <
0) {
return rv;
}
}
}
return 0;
}
/*
** Fill a number. The order is: optional-sign zero-filling conversion-digits
*/
static int fill_n(SprintfState* ss,
const char* src,
int srclen,
int width,
int prec,
int type,
int flags) {
int zerowidth =
0;
int precwidth =
0;
int signwidth =
0;
int leftspaces =
0;
int rightspaces =
0;
int cvtwidth;
int rv;
char sign;
if ((type &
1) ==
0) {
if (flags & FLAG_NEG) {
sign =
'-';
signwidth =
1;
}
else if (flags & FLAG_SIGNED) {
sign =
'+';
signwidth =
1;
}
else if (flags & FLAG_SPACED) {
sign =
' ';
signwidth =
1;
}
}
cvtwidth = signwidth + srclen;
if (prec >
0) {
if (prec > srclen) {
precwidth = prec - srclen;
/* Need zero filling */
cvtwidth += precwidth;
}
}
if ((flags & FLAG_ZEROS) && (prec <
0)) {
if (width > cvtwidth) {
zerowidth = width - cvtwidth;
/* Zero filling */
cvtwidth += zerowidth;
}
}
if (flags & FLAG_LEFT) {
if (width > cvtwidth) {
/* Space filling on the right (i.e. left adjusting) */
rightspaces = width - cvtwidth;
}
}
else {
if (width > cvtwidth) {
/* Space filling on the left (i.e. right adjusting) */
leftspaces = width - cvtwidth;
}
}
while (--leftspaces >=
0) {
rv = (*ss->stuff)(ss,
" ",
1);
if (rv <
0) {
return rv;
}
}
if (signwidth) {
rv = (*ss->stuff)(ss, &sign,
1);
if (rv <
0) {
return rv;
}
}
while (--precwidth >=
0) {
rv = (*ss->stuff)(ss,
"0",
1);
if (rv <
0) {
return rv;
}
}
while (--zerowidth >=
0) {
rv = (*ss->stuff)(ss,
"0",
1);
if (rv <
0) {
return rv;
}
}
rv = (*ss->stuff)(ss, src, srclen);
if (rv <
0) {
return rv;
}
while (--rightspaces >=
0) {
rv = (*ss->stuff)(ss,
" ",
1);
if (rv <
0) {
return rv;
}
}
return 0;
}
/*
** Convert a long into its printable form
*/
static int cvt_l(SprintfState* ss,
long num,
int width,
int prec,
int radix,
int type,
int flags,
const char* hexp) {
char cvtbuf[
100];
char* cvt;
int digits;
/* according to the man page this needs to happen */
if ((prec ==
0) && (num ==
0)) {
return 0;
}
/*
** Converting decimal is a little tricky. In the unsigned case we
** need to stop when we hit 10 digits. In the signed case, we can
** stop when the number is zero.
*/
cvt = cvtbuf +
sizeof(cvtbuf);
digits =
0;
while (num) {
int digit = (((
unsigned long)num) % radix) &
0xF;
*--cvt = hexp[digit];
digits++;
num = (
long)(((
unsigned long)num) / radix);
}
if (digits ==
0) {
*--cvt =
'0';
digits++;
}
/*
** Now that we have the number converted without its sign, deal with
** the sign and zero padding.
*/
return fill_n(ss, cvt, digits, width, prec, type, flags);
}
/*
** Convert a 64-bit integer into its printable form
*/
static int cvt_ll(SprintfState* ss, PRInt64 num,
int width,
int prec,
int radix,
int type,
int flags,
const char* hexp) {
char cvtbuf[
100];
char* cvt;
int digits;
PRInt64 rad;
/* according to the man page this needs to happen */
if ((prec ==
0) && (LL_IS_ZERO(num))) {
return 0;
}
/*
** Converting decimal is a little tricky. In the unsigned case we
** need to stop when we hit 10 digits. In the signed case, we can
** stop when the number is zero.
*/
LL_I2L(rad, radix);
cvt = cvtbuf +
sizeof(cvtbuf);
digits =
0;
while (!LL_IS_ZERO(num)) {
PRInt32 digit;
PRInt64 quot, rem;
LL_UDIVMOD(", &rem, num, rad);
LL_L2I(digit, rem);
*--cvt = hexp[digit &
0xf];
digits++;
num = quot;
}
if (digits ==
0) {
*--cvt =
'0';
digits++;
}
/*
** Now that we have the number converted without its sign, deal with
** the sign and zero padding.
*/
return fill_n(ss, cvt, digits, width, prec, type, flags);
}
/*
** Convert a double precision floating point number into its printable
** form.
**
** XXX stop using snprintf to convert floating point
*/
static int cvt_f(SprintfState* ss,
double d,
const char* fmt0,
const char* fmt1) {
char fin[
20];
char fout[
300];
int amount = fmt1 - fmt0;
if (amount <=
0 || amount >=
sizeof(fin)) {
/* Totally bogus % command to snprintf. Just ignore it */
return 0;
}
memcpy(fin, fmt0, amount);
fin[amount] =
0;
/* Convert floating point using the native snprintf code */
#ifdef DEBUG
{
const char* p = fin;
while (*p) {
PR_ASSERT(*p !=
'L');
p++;
}
}
#endif
memset(fout,
0,
sizeof(fout));
snprintf(fout,
sizeof(fout), fin, d);
/* Explicitly null-terminate fout because on Windows snprintf doesn't
* append a null-terminator if the buffer is too small. */
fout[
sizeof(fout) -
1] =
'\0';
return (*ss->stuff)(ss, fout, strlen(fout));
}
/*
** Convert a string into its printable form. "width" is the output
** width. "prec" is the maximum number of characters of "s" to output,
** where -1 means until NUL.
*/
static int cvt_s(SprintfState* ss,
const char* str,
int width,
int prec,
int flags) {
int slen;
if (prec ==
0) {
return 0;
}
/* Limit string length by precision value */
if (!str) {
str =
"(null)";
}
if (prec >
0) {
/* this is: slen = strnlen(str, prec); */
register const char* s;
for (s = str; prec && *s; s++, prec--);
slen = s - str;
}
else {
slen = strlen(str);
}
/* and away we go */
return fill2(ss, str, slen, width, flags);
}
/*
** BuildArgArray stands for Numbered Argument list Sprintf
** for example,
** fmt = "%4$i, %2$d, %3s, %1d";
** the number must start from 1, and no gap among them
*/
static struct NumArg* BuildArgArray(
const char* fmt, va_list ap,
int* rv,
struct NumArg* nasArray) {
int number =
0, cn =
0, i;
const char* p;
char c;
struct NumArg* nas;
/*
** first pass:
** determine how many legal % I have got, then allocate space
*/
p = fmt;
*rv =
0;
i =
0;
while ((c = *p++) !=
0) {
if (c !=
'%') {
continue;
}
if ((c = *p++) ==
'%') {
/* skip %% case */
continue;
}
while (c !=
0) {
if (c >
'9' || c <
'0') {
if (c ==
'$') {
/* numbered argument case */
if (i >
0) {
*rv = -
1;
return NULL;
}
number++;
}
else {
/* non-numbered argument case */
if (number >
0) {
*rv = -
1;
return NULL;
}
i =
1;
}
break;
}
c = *p++;
}
}
if (number ==
0) {
return NULL;
}
if (number > NAS_DEFAULT_NUM) {
nas = (
struct NumArg*)PR_MALLOC(number *
sizeof(
struct NumArg));
if (!nas) {
*rv = -
1;
return NULL;
}
}
else {
nas = nasArray;
}
for (i =
0; i < number; i++) {
nas[i].type = TYPE_UNKNOWN;
}
/*
** second pass:
** set nas[].type
*/
p = fmt;
while ((c = *p++) !=
0) {
if (c !=
'%') {
continue;
}
c = *p++;
if (c ==
'%') {
continue;
}
cn =
0;
while (c && c !=
'$') {
/* should improve error check later */
cn = cn *
10 + c -
'0';
c = *p++;
}
if (!c || cn <
1 || cn > number) {
*rv = -
1;
break;
}
/* nas[cn] starts from 0, and make sure nas[cn].type is not assigned */
cn--;
if (nas[cn].type != TYPE_UNKNOWN) {
continue;
}
c = *p++;
/* width */
if (c ==
'*') {
/* not supported feature, for the argument is not numbered */
*rv = -
1;
break;
}
while ((c >=
'0') && (c <=
'9')) {
c = *p++;
}
/* precision */
if (c ==
'.') {
c = *p++;
if (c ==
'*') {
/* not supported feature, for the argument is not numbered */
*rv = -
1;
break;
}
while ((c >=
'0') && (c <=
'9')) {
c = *p++;
}
}
/* size */
nas[cn].type = TYPE_INTN;
if (c ==
'h') {
nas[cn].type = TYPE_INT16;
c = *p++;
}
else if (c ==
'L') {
/* XXX not quite sure here */
nas[cn].type = TYPE_INT64;
c = *p++;
}
else if (c ==
'l') {
nas[cn].type = TYPE_INT32;
c = *p++;
if (c ==
'l') {
nas[cn].type = TYPE_INT64;
c = *p++;
}
}
else if (c ==
'z') {
if (
sizeof(size_t) ==
sizeof(PRInt32)) {
nas[cn].type = TYPE_INT32;
}
else if (
sizeof(size_t) ==
sizeof(PRInt64)) {
nas[cn].type = TYPE_INT64;
}
else {
nas[cn].type = TYPE_UNKNOWN;
}
c = *p++;
}
/* format */
switch (c) {
case 'd':
case 'c':
case 'i':
case 'o':
case 'u':
case 'x':
case 'X':
break;
case 'e':
case 'f':
case 'g':
nas[cn].type = TYPE_DOUBLE;
break;
case 'p':
/* XXX should use cpp */
if (
sizeof(
void*) ==
sizeof(PRInt32)) {
nas[cn].type = TYPE_UINT32;
}
else if (
sizeof(
void*) ==
sizeof(PRInt64)) {
nas[cn].type = TYPE_UINT64;
}
else if (
sizeof(
void*) ==
sizeof(PRIntn)) {
nas[cn].type = TYPE_UINTN;
}
else {
nas[cn].type = TYPE_UNKNOWN;
}
break;
case 'S':
#ifdef WIN32
nas[cn].type = TYPE_WSTRING;
break;
#endif
case 'C':
case 'E':
case 'G':
/* XXX not supported I suppose */
PR_ASSERT(
0);
nas[cn].type = TYPE_UNKNOWN;
break;
case 's':
nas[cn].type = TYPE_STRING;
break;
case 'n':
nas[cn].type = TYPE_INTSTR;
break;
default:
PR_ASSERT(
0);
nas[cn].type = TYPE_UNKNOWN;
break;
}
/* get a legal para. */
if (nas[cn].type == TYPE_UNKNOWN) {
*rv = -
1;
break;
}
}
/*
** third pass
** fill the nas[cn].ap
*/
if (*rv <
0) {
if (nas != nasArray) {
PR_DELETE(nas);
}
return NULL;
}
cn =
0;
while (cn < number) {
if (nas[cn].type == TYPE_UNKNOWN) {
cn++;
continue;
}
switch (nas[cn].type) {
case TYPE_INT16:
case TYPE_UINT16:
case TYPE_INTN:
nas[cn].u.i = va_arg(ap,
int);
break;
case TYPE_UINTN:
nas[cn].u.ui = va_arg(ap,
unsigned int);
break;
case TYPE_INT32:
nas[cn].u.i32 = va_arg(ap, PRInt32);
break;
case TYPE_UINT32:
nas[cn].u.ui32 = va_arg(ap, PRUint32);
break;
case TYPE_INT64:
nas[cn].u.ll = va_arg(ap, PRInt64);
break;
case TYPE_UINT64:
nas[cn].u.ull = va_arg(ap, PRUint64);
break;
case TYPE_STRING:
nas[cn].u.s = va_arg(ap,
char*);
break;
#ifdef WIN32
case TYPE_WSTRING:
nas[cn].u.ws = va_arg(ap, WCHAR*);
break;
#endif
case TYPE_INTSTR:
nas[cn].u.ip = va_arg(ap,
int*);
break;
case TYPE_DOUBLE:
nas[cn].u.d = va_arg(ap,
double);
break;
default:
if (nas != nasArray) {
PR_DELETE(nas);
}
*rv = -
1;
return NULL;
}
cn++;
}
return nas;
}
/*
** The workhorse sprintf code.
*/
static int dosprintf(SprintfState* ss,
const char* fmt, va_list ap) {
char c;
int flags, width, prec, radix, type;
union {
char ch;
int i;
long l;
PRInt64 ll;
double d;
const char* s;
int* ip;
#ifdef WIN32
const WCHAR* ws;
#endif
} u;
const char* fmt0;
static char* hex =
"0123456789abcdef";
static char* HEX =
"0123456789ABCDEF";
char* hexp;
int rv, i;
struct NumArg* nas = NULL;
struct NumArg* nap = NULL;
struct NumArg nasArray[NAS_DEFAULT_NUM];
char pattern[
20];
const char* dolPt = NULL;
/* in "%4$.2f", dolPt will point to . */
#ifdef WIN32
char* pBuf = NULL;
#endif
/*
** build an argument array, IF the fmt is numbered argument
** list style, to contain the Numbered Argument list pointers
*/
nas = BuildArgArray(fmt, ap, &rv, nasArray);
if (rv <
0) {
/* the fmt contains error Numbered Argument format, jliu@netscape.com */
PR_ASSERT(
0);
return rv;
}
while ((c = *fmt++) !=
0) {
if (c !=
'%') {
rv = (*ss->stuff)(ss, fmt -
1,
1);
if (rv <
0) {
return rv;
}
continue;
}
fmt0 = fmt -
1;
/*
** Gobble up the % format string. Hopefully we have handled all
** of the strange cases!
*/
flags =
0;
c = *fmt++;
if (c ==
'%') {
/* quoting a % with %% */
rv = (*ss->stuff)(ss, fmt -
1,
1);
if (rv <
0) {
return rv;
}
continue;
}
if (nas != NULL) {
/* the fmt contains the Numbered Arguments feature */
i =
0;
while (c && c !=
'$') {
/* should improve error check later */
i = (i *
10) + (c -
'0');
c = *fmt++;
}
if (nas[i -
1].type == TYPE_UNKNOWN) {
if (nas && (nas != nasArray)) {
PR_DELETE(nas);
}
return -
1;
}
nap = &nas[i -
1];
dolPt = fmt;
c = *fmt++;
}
/*
* Examine optional flags. Note that we do not implement the
* '#' flag of sprintf(). The ANSI C spec. of the '#' flag is
* somewhat ambiguous and not ideal, which is perhaps why
* the various sprintf() implementations are inconsistent
* on this feature.
*/
while ((c ==
'-') || (c ==
'+') || (c ==
' ') || (c ==
'0')) {
if (c ==
'-') {
flags |= FLAG_LEFT;
}
if (c ==
'+') {
flags |= FLAG_SIGNED;
}
if (c ==
' ') {
flags |= FLAG_SPACED;
}
if (c ==
'0') {
flags |= FLAG_ZEROS;
}
c = *fmt++;
}
if (flags & FLAG_SIGNED) {
flags &= ~FLAG_SPACED;
}
if (flags & FLAG_LEFT) {
flags &= ~FLAG_ZEROS;
}
/* width */
if (c ==
'*') {
c = *fmt++;
width = va_arg(ap,
int);
}
else {
width =
0;
while ((c >=
'0') && (c <=
'9')) {
width = (width *
10) + (c -
'0');
c = *fmt++;
}
}
/* precision */
prec = -
1;
if (c ==
'.') {
c = *fmt++;
if (c ==
'*') {
c = *fmt++;
prec = va_arg(ap,
int);
}
else {
prec =
0;
while ((c >=
'0') && (c <=
'9')) {
prec = (prec *
10) + (c -
'0');
c = *fmt++;
}
}
}
/* size */
type = TYPE_INTN;
if (c ==
'h') {
type = TYPE_INT16;
c = *fmt++;
}
else if (c ==
'L') {
/* XXX not quite sure here */
type = TYPE_INT64;
c = *fmt++;
}
else if (c ==
'l') {
type = TYPE_INT32;
c = *fmt++;
if (c ==
'l') {
type = TYPE_INT64;
c = *fmt++;
}
}
else if (c ==
'z') {
if (
sizeof(size_t) ==
sizeof(PRInt32)) {
type = TYPE_INT32;
}
else if (
sizeof(size_t) ==
sizeof(PRInt64)) {
type = TYPE_INT64;
}
c = *fmt++;
}
/* format */
hexp = hex;
switch (c) {
case 'd':
case 'i':
/* decimal/integer */
radix =
10;
goto fetch_and_convert;
case 'o':
/* octal */
radix =
8;
type |=
1;
goto fetch_and_convert;
case 'u':
/* unsigned decimal */
radix =
10;
type |=
1;
goto fetch_and_convert;
case 'x':
/* unsigned hex */
radix =
16;
type |=
1;
goto fetch_and_convert;
case 'X':
/* unsigned HEX */
radix =
16;
hexp = HEX;
type |=
1;
goto fetch_and_convert;
fetch_and_convert:
switch (type) {
case TYPE_INT16:
u.l = nas ? nap->u.i : va_arg(ap,
int);
if (u.l <
0) {
u.l = -u.l;
flags |= FLAG_NEG;
}
goto do_long;
case TYPE_UINT16:
u.l = (nas ? nap->u.i : va_arg(ap,
int)) &
0xffff;
goto do_long;
case TYPE_INTN:
u.l = nas ? nap->u.i : va_arg(ap,
int);
if (u.l <
0) {
u.l = -u.l;
flags |= FLAG_NEG;
}
goto do_long;
case TYPE_UINTN:
u.l = (
long)(nas ? nap->u.ui : va_arg(ap,
unsigned int));
goto do_long;
case TYPE_INT32:
u.l = nas ? nap->u.i32 : va_arg(ap, PRInt32);
if (u.l <
0) {
u.l = -u.l;
flags |= FLAG_NEG;
}
goto do_long;
case TYPE_UINT32:
u.l = (
long)(nas ? nap->u.ui32 : va_arg(ap, PRUint32));
do_long:
rv = cvt_l(ss, u.l, width, prec, radix, type, flags, hexp);
if (rv <
0) {
return rv;
}
break;
case TYPE_INT64:
u.ll = nas ? nap->u.ll : va_arg(ap, PRInt64);
if (!LL_GE_ZERO(u.ll)) {
LL_NEG(u.ll, u.ll);
flags |= FLAG_NEG;
}
goto do_longlong;
case TYPE_UINT64:
u.ll = nas ? nap->u.ull : va_arg(ap, PRUint64);
do_longlong:
rv = cvt_ll(ss, u.ll, width, prec, radix, type, flags, hexp);
if (rv <
0) {
return rv;
}
break;
}
break;
case 'e':
case 'E':
case 'f':
case 'g':
u.d = nas ? nap->u.d : va_arg(ap,
double);
if (nas != NULL) {
i = fmt - dolPt;
if (i <
sizeof(pattern)) {
pattern[
0] =
'%';
memcpy(&pattern[
1], dolPt, i);
rv = cvt_f(ss, u.d, pattern, &pattern[i +
1]);
}
}
else {
rv = cvt_f(ss, u.d, fmt0, fmt);
}
if (rv <
0) {
return rv;
}
break;
case 'c':
u.ch = nas ? nap->u.i : va_arg(ap,
int);
if ((flags & FLAG_LEFT) ==
0) {
while (width-- >
1) {
rv = (*ss->stuff)(ss,
" ",
1);
if (rv <
0) {
return rv;
}
}
}
rv = (*ss->stuff)(ss, &u.ch,
1);
if (rv <
0) {
return rv;
}
if (flags & FLAG_LEFT) {
while (width-- >
1) {
rv = (*ss->stuff)(ss,
" ",
1);
if (rv <
0) {
return rv;
}
}
}
break;
case 'p':
if (
sizeof(
void*) ==
sizeof(PRInt32)) {
type = TYPE_UINT32;
}
else if (
sizeof(
void*) ==
sizeof(PRInt64)) {
type = TYPE_UINT64;
}
else if (
sizeof(
void*) ==
sizeof(
int)) {
type = TYPE_UINTN;
}
else {
PR_ASSERT(
0);
break;
}
radix =
16;
goto fetch_and_convert;
#ifndef WIN32
case 'S':
/* XXX not supported I suppose */
PR_ASSERT(
0);
break;
#endif
#if 0
case 'C':
case 'E':
case 'G':
/* XXX not supported I suppose */
PR_ASSERT(
0);
break;
#endif
#ifdef WIN32
case 'S':
u.ws = nas ? nap->u.ws : va_arg(ap,
const WCHAR*);
/* Get the required size in rv */
rv = WideCharToMultiByte(CP_ACP,
0, u.ws, -
1, NULL,
0, NULL, NULL);
if (rv ==
0) {
rv =
1;
}
pBuf = PR_MALLOC(rv);
WideCharToMultiByte(CP_ACP,
0, u.ws, -
1, pBuf, (
int)rv, NULL, NULL);
pBuf[rv -
1] =
'\0';
rv = cvt_s(ss, pBuf, width, prec, flags);
/* We don't need the allocated buffer anymore */
PR_Free(pBuf);
if (rv <
0) {
return rv;
}
break;
#endif
case 's':
u.s = nas ? nap->u.s : va_arg(ap,
const char*);
rv = cvt_s(ss, u.s, width, prec, flags);
if (rv <
0) {
return rv;
}
break;
case 'n':
u.ip = nas ? nap->u.ip : va_arg(ap,
int*);
if (u.ip) {
*u.ip = ss->cur - ss->base;
}
break;
default:
/* Not a % token after all... skip it */
#if 0
PR_ASSERT(
0);
#endif
rv = (*ss->stuff)(ss,
"%",
1);
if (rv <
0) {
return rv;
}
rv = (*ss->stuff)(ss, fmt -
1,
1);
if (rv <
0) {
return rv;
}
}
}
/* Stuff trailing NUL */
rv = (*ss->stuff)(ss,
"\0",
1);
if (nas && (nas != nasArray)) {
PR_DELETE(nas);
}
return rv;
}
/************************************************************************/
static int FuncStuff(SprintfState* ss,
const char* sp, PRUint32 len) {
int rv;
/*
** We will add len to ss->maxlen at the end of the function. First check
** if ss->maxlen + len would overflow or be greater than PR_INT32_MAX.
*/
if (PR_UINT32_MAX - ss->maxlen < len || ss->maxlen + len > PR_INT32_MAX) {
return -
1;
}
rv = (*ss->func)(ss->arg, sp, len);
if (rv <
0) {
return rv;
}
ss->maxlen += len;
return 0;
}
PR_IMPLEMENT(PRUint32)
PR_sxprintf(PRStuffFunc func,
void* arg,
const char* fmt, ...) {
va_list ap;
PRUint32 rv;
va_start(ap, fmt);
rv = PR_vsxprintf(func, arg, fmt, ap);
va_end(ap);
return rv;
}
PR_IMPLEMENT(PRUint32)
PR_vsxprintf(PRStuffFunc func,
void* arg,
const char* fmt, va_list ap) {
SprintfState ss;
int rv;
ss.stuff = FuncStuff;
ss.func = func;
ss.arg = arg;
ss.maxlen =
0;
rv = dosprintf(&ss, fmt, ap);
return (rv <
0) ? (PRUint32)-
1 : ss.maxlen;
}
/*
** Stuff routine that automatically grows the malloc'd output buffer
** before it overflows.
*/
static int GrowStuff(SprintfState* ss,
const char* sp, PRUint32 len) {
ptrdiff_t off;
char* newbase;
PRUint32 newlen;
off = ss->cur - ss->base;
if (PR_UINT32_MAX - len < off) {
/* off + len would be too big. */
return -
1;
}
if (off + len >= ss->maxlen) {
/* Grow the buffer */
PRUint32 increment = (len >
32) ? len :
32;
if (PR_UINT32_MAX - ss->maxlen < increment) {
/* ss->maxlen + increment would overflow. */
return -
1;
}
newlen = ss->maxlen + increment;
if (newlen > PR_INT32_MAX) {
return -
1;
}
if (ss->base) {
newbase = (
char*)PR_REALLOC(ss->base, newlen);
}
else {
newbase = (
char*)PR_MALLOC(newlen);
}
if (!newbase) {
/* Ran out of memory */
return -
1;
}
ss->base = newbase;
ss->maxlen = newlen;
ss->cur = ss->base + off;
}
/* Copy data */
while (len) {
--len;
*ss->cur++ = *sp++;
}
PR_ASSERT((PRUint32)(ss->cur - ss->base) <= ss->maxlen);
return 0;
}
/*
** sprintf into a malloc'd buffer
*/
PR_IMPLEMENT(
char*) PR_smprintf(
const char* fmt, ...) {
va_list ap;
char* rv;
va_start(ap, fmt);
rv = PR_vsmprintf(fmt, ap);
va_end(ap);
return rv;
}
/*
** Free memory allocated, for the caller, by PR_smprintf
*/
PR_IMPLEMENT(
void) PR_smprintf_free(
char* mem) { PR_DELETE(mem); }
PR_IMPLEMENT(
char*) PR_vsmprintf(
const char* fmt, va_list ap) {
SprintfState ss;
int rv;
ss.stuff = GrowStuff;
ss.base =
0;
ss.cur =
0;
ss.maxlen =
0;
rv = dosprintf(&ss, fmt, ap);
if (rv <
0) {
if (ss.base) {
PR_DELETE(ss.base);
}
return 0;
}
return ss.base;
}
/*
** Stuff routine that discards overflow data
*/
static int LimitStuff(SprintfState* ss,
const char* sp, PRUint32 len) {
PRUint32 limit = ss->maxlen - (ss->cur - ss->base);
if (len > limit) {
len = limit;
}
while (len) {
--len;
*ss->cur++ = *sp++;
}
return 0;
}
/*
** sprintf into a fixed size buffer. Make sure there is a NUL at the end
** when finished.
*/
PR_IMPLEMENT(PRUint32)
PR_snprintf(
char* out, PRUint32 outlen,
const char* fmt, ...) {
va_list ap;
PRUint32 rv;
va_start(ap, fmt);
rv = PR_vsnprintf(out, outlen, fmt, ap);
va_end(ap);
return rv;
}
PR_IMPLEMENT(PRUint32)
PR_vsnprintf(
char* out, PRUint32 outlen,
const char* fmt, va_list ap) {
SprintfState ss;
PRUint32 n;
PR_ASSERT(outlen !=
0 && outlen <= PR_INT32_MAX);
if (outlen ==
0 || outlen > PR_INT32_MAX) {
return 0;
}
ss.stuff = LimitStuff;
ss.base = out;
ss.cur = out;
ss.maxlen = outlen;
(
void)dosprintf(&ss, fmt, ap);
/* If we added chars, and we didn't append a null, do it now. */
if ((ss.cur != ss.base) && (*(ss.cur -
1) !=
'\0')) {
*(ss.cur -
1) =
'\0';
}
n = ss.cur - ss.base;
return n ? n -
1 : n;
}
PR_IMPLEMENT(
char*) PR_sprintf_append(
char* last,
const char* fmt, ...) {
va_list ap;
char* rv;
va_start(ap, fmt);
rv = PR_vsprintf_append(last, fmt, ap);
va_end(ap);
return rv;
}
PR_IMPLEMENT(
char*)
PR_vsprintf_append(
char* last,
const char* fmt, va_list ap) {
SprintfState ss;
int rv;
ss.stuff = GrowStuff;
if (last) {
size_t lastlen = strlen(last);
if (lastlen > PR_INT32_MAX) {
return 0;
}
ss.base = last;
ss.cur = last + lastlen;
ss.maxlen = lastlen;
}
else {
ss.base =
0;
ss.cur =
0;
ss.maxlen =
0;
}
rv = dosprintf(&ss, fmt, ap);
if (rv <
0) {
if (ss.base) {
PR_DELETE(ss.base);
}
return 0;
}
return ss.base;
}