mozglue/misc/Printf.cpp
author Gerald Squelart <gsquelart@mozilla.com>
Thu, 04 Jul 2019 04:38:16 +0000
changeset 481213 8fed7bc35767fdfab4bac0908ae9b21c08f49e1f
parent 466869 a5c4f7e6069a1962f5364226f4746914c08ae6ef
child 507983 68b0f6bd38ad89654bde1da2f3755597f6807a43
permissions -rw-r--r--
Bug 1559000 - mozglue's AutoProfilerLabel doesn't need to know about ProfilingStack - r=mstange `ProfilingStack*` happens to be the information that the current Gecko Profiler entry function wants to forward to the exit function, but AutoProfilerLabel does not really need to know about that. Changing it to `void*`, so that we can later use different entry/exit functions that use different context types. Differential Revision: https://phabricator.services.mozilla.com/D34806

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * 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 "mozilla/AllocPolicy.h"
#include "mozilla/Likely.h"
#include "mozilla/Printf.h"
#include "mozilla/Sprintf.h"
#include "mozilla/UniquePtrExtensions.h"
#include "mozilla/Vector.h"

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if defined(XP_WIN)
#  include <windows.h>
#endif

/*
 * Note: on some platforms va_list is defined as an array,
 * and requires array notation.
 */
#ifdef HAVE_VA_COPY
#  define VARARGS_ASSIGN(foo, bar) VA_COPY(foo, bar)
#elif defined(HAVE_VA_LIST_AS_ARRAY)
#  define VARARGS_ASSIGN(foo, bar) foo[0] = bar[0]
#else
#  define VARARGS_ASSIGN(foo, bar) (foo) = (bar)
#endif

/*
 * Numbered Argument State
 */
struct NumArgState {
  int type;    // type of the current ap
  va_list ap;  // point to the corresponding position on ap
};

typedef mozilla::Vector<NumArgState, 20, mozilla::MallocAllocPolicy>
    NumArgStateVector;

#define TYPE_SHORT 0
#define TYPE_USHORT 1
#define TYPE_INTN 2
#define TYPE_UINTN 3
#define TYPE_LONG 4
#define TYPE_ULONG 5
#define TYPE_LONGLONG 6
#define TYPE_ULONGLONG 7
#define TYPE_STRING 8
#define TYPE_DOUBLE 9
#define TYPE_INTSTR 10
#define TYPE_POINTER 11
#if defined(XP_WIN)
#  define TYPE_WSTRING 12
#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

static const char hex[] = "0123456789abcdef";
static const char HEX[] = "0123456789ABCDEF";

// Fill into the buffer using the data in src
bool mozilla::PrintfTarget::fill2(const char* src, int srclen, int width,
                                  int flags) {
  char space = ' ';

  width -= srclen;
  if (width > 0 && (flags & FLAG_LEFT) == 0) {  // Right adjusting
    if (flags & FLAG_ZEROS) space = '0';
    while (--width >= 0) {
      if (!emit(&space, 1)) return false;
    }
  }

  // Copy out the source data
  if (!emit(src, srclen)) return false;

  if (width > 0 && (flags & FLAG_LEFT) != 0) {  // Left adjusting
    while (--width >= 0) {
      if (!emit(&space, 1)) return false;
    }
  }
  return true;
}

/*
 * Fill a number. The order is: optional-sign zero-filling conversion-digits
 */
bool mozilla::PrintfTarget::fill_n(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;
  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) {
    if (!emit(" ", 1)) return false;
  }
  if (signwidth) {
    if (!emit(&sign, 1)) return false;
  }
  while (--precwidth >= 0) {
    if (!emit("0", 1)) return false;
  }
  while (--zerowidth >= 0) {
    if (!emit("0", 1)) return false;
  }
  if (!emit(src, uint32_t(srclen))) return false;
  while (--rightspaces >= 0) {
    if (!emit(" ", 1)) return false;
  }
  return true;
}

// All that the cvt_* functions care about as far as the TYPE_* constants is
// that the low bit is set to indicate unsigned, or unset to indicate signed.
// So we don't try to hard to ensure that the passed TYPE_* constant lines
// up with the actual size of the number being printed here.  The main printf
// code, below, does have to care so that the correct bits are extracted from
// the varargs list.
bool mozilla::PrintfTarget::appendIntDec(int32_t num) {
  int flags = 0;
  long n = num;
  if (n < 0) {
    n = -n;
    flags |= FLAG_NEG;
  }
  return cvt_l(n, -1, -1, 10, TYPE_INTN, flags, hex);
}

bool mozilla::PrintfTarget::appendIntDec(uint32_t num) {
  return cvt_l(num, -1, -1, 10, TYPE_UINTN, 0, hex);
}

bool mozilla::PrintfTarget::appendIntOct(uint32_t num) {
  return cvt_l(num, -1, -1, 8, TYPE_UINTN, 0, hex);
}

bool mozilla::PrintfTarget::appendIntHex(uint32_t num) {
  return cvt_l(num, -1, -1, 16, TYPE_UINTN, 0, hex);
}

bool mozilla::PrintfTarget::appendIntDec(int64_t num) {
  int flags = 0;
  if (num < 0) {
    num = -num;
    flags |= FLAG_NEG;
  }
  return cvt_ll(num, -1, -1, 10, TYPE_INTN, flags, hex);
}

bool mozilla::PrintfTarget::appendIntDec(uint64_t num) {
  return cvt_ll(num, -1, -1, 10, TYPE_UINTN, 0, hex);
}

bool mozilla::PrintfTarget::appendIntOct(uint64_t num) {
  return cvt_ll(num, -1, -1, 8, TYPE_UINTN, 0, hex);
}

bool mozilla::PrintfTarget::appendIntHex(uint64_t num) {
  return cvt_ll(num, -1, -1, 16, TYPE_UINTN, 0, hex);
}

/* Convert a long into its printable form. */
bool mozilla::PrintfTarget::cvt_l(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 true;

  // 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(cvt, digits, width, prec, type, flags);
}

/* Convert a 64-bit integer into its printable form. */
bool mozilla::PrintfTarget::cvt_ll(int64_t num, int width, int prec, int radix,
                                   int type, int flags, const char* hexp) {
  // According to the man page, this needs to happen.
  if (prec == 0 && num == 0) return true;

  // 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.
  int64_t rad = int64_t(radix);
  char cvtbuf[100];
  char* cvt = cvtbuf + sizeof(cvtbuf);
  int digits = 0;
  while (num != 0) {
    int64_t quot = uint64_t(num) / rad;
    int64_t rem = uint64_t(num) % rad;
    int32_t digit = int32_t(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(cvt, digits, width, prec, type, flags);
}

/*
 * Convert a double precision floating point number into its printable
 * form.
 */
bool mozilla::PrintfTarget::cvt_f(double d, const char* fmt0,
                                  const char* fmt1) {
  char fin[20];
  // The size is chosen such that we can print DBL_MAX.  See bug#1350097.
  char fout[320];
  int amount = fmt1 - fmt0;

  MOZ_ASSERT((amount > 0) && (amount < (int)sizeof(fin)));
  if (amount >= (int)sizeof(fin)) {
    // Totally bogus % command to sprintf. Just ignore it
    return true;
  }
  memcpy(fin, fmt0, (size_t)amount);
  fin[amount] = 0;

  // Convert floating point using the native snprintf code
#ifdef DEBUG
  {
    const char* p = fin;
    while (*p) {
      MOZ_ASSERT(*p != 'L');
      p++;
    }
  }
#endif
  size_t len = SprintfLiteral(fout, fin, d);
  // Note that SprintfLiteral will always write a \0 at the end, so a
  // "<=" check here would be incorrect -- the buffer size passed to
  // snprintf includes the trailing \0, but the returned length does
  // not.
  if (MOZ_LIKELY(len < sizeof(fout))) {
    return emit(fout, len);
  }

  // Maybe the user used "%500.500f" or something like that.
  size_t buf_size = len + 1;
  UniqueFreePtr<char> buf((char*)malloc(buf_size));
  if (!buf) {
    return false;
  }
  len = snprintf(buf.get(), buf_size, fin, d);
  // If this assert fails, then SprintfLiteral has a bug -- and in
  // this case we would like to learn of it, which is why there is a
  // release assert.
  MOZ_RELEASE_ASSERT(len < buf_size);

  return emit(buf.get(), len);
}

/*
 * 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.
 */
bool mozilla::PrintfTarget::cvt_s(const char* s, int width, int prec,
                                  int flags) {
  if (prec == 0) return true;
  if (!s) s = "(null)";

  // Limit string length by precision value
  int slen = int(strlen(s));
  if (0 < prec && prec < slen) slen = prec;

  // and away we go
  return fill2(s, slen, width, flags);
}

/*
 * BuildArgArray stands for Numbered Argument list Sprintf
 * for example,
 *      fmp = "%4$i, %2$d, %3s, %1d";
 * the number must start from 1, and no gap among them
 */
static bool BuildArgArray(const char* fmt, va_list ap, NumArgStateVector& nas) {
  size_t number = 0, cn = 0, i;
  const char* p;
  char c;

  // First pass:
  // Detemine how many legal % I have got, then allocate space.

  p = fmt;
  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) MOZ_CRASH("Bad format string");
          number++;
        } else {  // non-numbered argument case
          if (number > 0) MOZ_CRASH("Bad format string");
          i = 1;
        }
        break;
      }

      c = *p++;
    }
  }

  if (number == 0) return true;

  // Only allow a limited number of arguments.
  MOZ_RELEASE_ASSERT(number <= 20);

  if (!nas.growByUninitialized(number)) return false;

  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) MOZ_CRASH("Bad format string");

    // nas[cn] starts from 0, and make sure nas[cn].type is not assigned.
    cn--;
    if (nas[cn].type != TYPE_UNKNOWN) continue;

    c = *p++;

    // flags
    while ((c == '-') || (c == '+') || (c == ' ') || (c == '0')) {
      c = *p++;
    }

    // width
    if (c == '*') {
      // not supported feature, for the argument is not numbered
      MOZ_CRASH("Bad format string");
    }

    while ((c >= '0') && (c <= '9')) {
      c = *p++;
    }

    // precision
    if (c == '.') {
      c = *p++;
      if (c == '*') {
        // not supported feature, for the argument is not numbered
        MOZ_CRASH("Bad format string");
      }

      while ((c >= '0') && (c <= '9')) {
        c = *p++;
      }
    }

    // size
    nas[cn].type = TYPE_INTN;
    if (c == 'h') {
      nas[cn].type = TYPE_SHORT;
      c = *p++;
    } else if (c == 'L') {
      nas[cn].type = TYPE_LONGLONG;
      c = *p++;
    } else if (c == 'l') {
      nas[cn].type = TYPE_LONG;
      c = *p++;
      if (c == 'l') {
        nas[cn].type = TYPE_LONGLONG;
        c = *p++;
      }
    } else if (c == 'z' || c == 'I') {
      static_assert(sizeof(size_t) == sizeof(int) ||
                        sizeof(size_t) == sizeof(long) ||
                        sizeof(size_t) == sizeof(long long),
                    "size_t is not one of the expected sizes");
      nas[cn].type =
          sizeof(size_t) == sizeof(int)
              ? TYPE_INTN
              : sizeof(size_t) == sizeof(long) ? TYPE_LONG : TYPE_LONGLONG;
      c = *p++;
    }

    // format
    switch (c) {
      case 'd':
      case 'c':
      case 'i':
        break;

      case 'o':
      case 'u':
      case 'x':
      case 'X':
        // Mark as unsigned type.
        nas[cn].type |= 1;
        break;

      case 'e':
      case 'f':
      case 'g':
        nas[cn].type = TYPE_DOUBLE;
        break;

      case 'p':
        nas[cn].type = TYPE_POINTER;
        break;

      case 'S':
#if defined(XP_WIN)
        nas[cn].type = TYPE_WSTRING;
#else
        MOZ_ASSERT(0);
        nas[cn].type = TYPE_UNKNOWN;
#endif
        break;

      case 's':
#if defined(XP_WIN)
        if (nas[cn].type == TYPE_LONG) {
          nas[cn].type = TYPE_WSTRING;
          break;
        }
#endif
        // Other type sizes are not supported here.
        MOZ_ASSERT(nas[cn].type == TYPE_INTN);
        nas[cn].type = TYPE_STRING;
        break;

      case 'n':
        nas[cn].type = TYPE_INTSTR;
        break;

      default:
        MOZ_ASSERT(0);
        nas[cn].type = TYPE_UNKNOWN;
        break;
    }

    // get a legal para.
    if (nas[cn].type == TYPE_UNKNOWN) MOZ_CRASH("Bad format string");
  }

  // Third pass:
  // Fill nas[].ap.

  cn = 0;
  while (cn < number) {
    // A TYPE_UNKNOWN here means that the format asked for a
    // positional argument without specifying the meaning of some
    // earlier argument.
    MOZ_ASSERT(nas[cn].type != TYPE_UNKNOWN);

    VARARGS_ASSIGN(nas[cn].ap, ap);

    switch (nas[cn].type) {
      case TYPE_SHORT:
      case TYPE_USHORT:
      case TYPE_INTN:
      case TYPE_UINTN:
        (void)va_arg(ap, int);
        break;
      case TYPE_LONG:
        (void)va_arg(ap, long);
        break;
      case TYPE_ULONG:
        (void)va_arg(ap, unsigned long);
        break;
      case TYPE_LONGLONG:
        (void)va_arg(ap, long long);
        break;
      case TYPE_ULONGLONG:
        (void)va_arg(ap, unsigned long long);
        break;
      case TYPE_STRING:
        (void)va_arg(ap, char*);
        break;
      case TYPE_INTSTR:
        (void)va_arg(ap, int*);
        break;
      case TYPE_DOUBLE:
        (void)va_arg(ap, double);
        break;
      case TYPE_POINTER:
        (void)va_arg(ap, void*);
        break;
#if defined(XP_WIN)
      case TYPE_WSTRING:
        (void)va_arg(ap, wchar_t*);
        break;
#endif

      default:
        MOZ_CRASH();
    }

    cn++;
  }

  return true;
}

mozilla::PrintfTarget::PrintfTarget() : mEmitted(0) {}

bool mozilla::PrintfTarget::vprint(const char* fmt, va_list ap) {
  char c;
  int flags, width, prec, radix, type;
  union {
    char ch;
    int i;
    long l;
    long long ll;
    double d;
    const char* s;
    int* ip;
    void* p;
#if defined(XP_WIN)
    const wchar_t* ws;
#endif
  } u;
  const char* fmt0;
  const char* hexp;
  int i;
  char pattern[20];
  const char* dolPt = nullptr;  // in "%4$.2f", dolPt will point to '.'

  // Build an argument array, IF the fmt is numbered argument
  // list style, to contain the Numbered Argument list pointers.

  NumArgStateVector nas;
  if (!BuildArgArray(fmt, ap, nas)) {
    // the fmt contains error Numbered Argument format, jliu@netscape.com
    MOZ_CRASH("Bad format string");
  }

  while ((c = *fmt++) != 0) {
    if (c != '%') {
      if (!emit(fmt - 1, 1)) return false;

      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 %%
      if (!emit(fmt - 1, 1)) return false;

      continue;
    }

    if (!nas.empty()) {
      // 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) MOZ_CRASH("Bad format string");

      ap = nas[i - 1].ap;
      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);
      if (width < 0) {
        width = -width;
        flags |= FLAG_LEFT;
        flags &= ~FLAG_ZEROS;
      }
    } 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_SHORT;
      c = *fmt++;
    } else if (c == 'L') {
      type = TYPE_LONGLONG;
      c = *fmt++;
    } else if (c == 'l') {
      type = TYPE_LONG;
      c = *fmt++;
      if (c == 'l') {
        type = TYPE_LONGLONG;
        c = *fmt++;
      }
    } else if (c == 'z' || c == 'I') {
      static_assert(sizeof(size_t) == sizeof(int) ||
                        sizeof(size_t) == sizeof(long) ||
                        sizeof(size_t) == sizeof(long long),
                    "size_t is not one of the expected sizes");
      type = sizeof(size_t) == sizeof(int)
                 ? TYPE_INTN
                 : sizeof(size_t) == sizeof(long) ? TYPE_LONG : TYPE_LONGLONG;
      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_SHORT:
            u.l = va_arg(ap, int);
            if (u.l < 0) {
              u.l = -u.l;
              flags |= FLAG_NEG;
            }
            goto do_long;
          case TYPE_USHORT:
            u.l = (unsigned short)va_arg(ap, unsigned int);
            goto do_long;
          case TYPE_INTN:
            u.l = va_arg(ap, int);
            if (u.l < 0) {
              u.l = -u.l;
              flags |= FLAG_NEG;
            }
            goto do_long;
          case TYPE_UINTN:
            u.l = (long)va_arg(ap, unsigned int);
            goto do_long;

          case TYPE_LONG:
            u.l = va_arg(ap, long);
            if (u.l < 0) {
              u.l = -u.l;
              flags |= FLAG_NEG;
            }
            goto do_long;
          case TYPE_ULONG:
            u.l = (long)va_arg(ap, unsigned long);
          do_long:
            if (!cvt_l(u.l, width, prec, radix, type, flags, hexp))
              return false;

            break;

          case TYPE_LONGLONG:
            u.ll = va_arg(ap, long long);
            if (u.ll < 0) {
              u.ll = -u.ll;
              flags |= FLAG_NEG;
            }
            goto do_longlong;
          case TYPE_POINTER:
            u.ll = (uintptr_t)va_arg(ap, void*);
            goto do_longlong;
          case TYPE_ULONGLONG:
            u.ll = va_arg(ap, unsigned long long);
          do_longlong:
            if (!cvt_ll(u.ll, width, prec, radix, type, flags, hexp))
              return false;

            break;
        }
        break;

      case 'e':
      case 'E':
      case 'f':
      case 'g':
        u.d = va_arg(ap, double);
        if (!nas.empty()) {
          i = fmt - dolPt;
          if (i < int(sizeof(pattern))) {
            pattern[0] = '%';
            memcpy(&pattern[1], dolPt, size_t(i));
            if (!cvt_f(u.d, pattern, &pattern[i + 1])) return false;
          }
        } else {
          if (!cvt_f(u.d, fmt0, fmt)) return false;
        }

        break;

      case 'c':
        if ((flags & FLAG_LEFT) == 0) {
          while (width-- > 1) {
            if (!emit(" ", 1)) return false;
          }
        }
        switch (type) {
          case TYPE_SHORT:
          case TYPE_INTN:
            u.ch = va_arg(ap, int);
            if (!emit(&u.ch, 1)) return false;
            break;
        }
        if (flags & FLAG_LEFT) {
          while (width-- > 1) {
            if (!emit(" ", 1)) return false;
          }
        }
        break;

      case 'p':
        type = TYPE_POINTER;
        radix = 16;
        goto fetch_and_convert;

      case 's':
        if (type == TYPE_INTN) {
          u.s = va_arg(ap, const char*);
          if (!cvt_s(u.s, width, prec, flags)) return false;
          break;
        }
        MOZ_ASSERT(type == TYPE_LONG);
        MOZ_FALLTHROUGH;
      case 'S':
#if defined(XP_WIN)
      {
        u.ws = va_arg(ap, const wchar_t*);

        int rv = WideCharToMultiByte(CP_ACP, 0, u.ws, -1, NULL, 0, NULL, NULL);
        if (rv == 0 && GetLastError() == ERROR_NO_UNICODE_TRANSLATION) {
          if (!cvt_s("<unicode errors in string>", width, prec, flags)) {
            return false;
          }
        } else {
          if (rv == 0) {
            rv = 1;
          }
          UniqueFreePtr<char[]> buf((char*)malloc(rv));
          WideCharToMultiByte(CP_ACP, 0, u.ws, -1, buf.get(), rv, NULL, NULL);
          buf[rv - 1] = '\0';

          if (!cvt_s(buf.get(), width, prec, flags)) {
            return false;
          }
        }
      }
#else
        // Not supported here.
        MOZ_ASSERT(0);
#endif
      break;

      case 'n':
        u.ip = va_arg(ap, int*);
        if (u.ip) {
          *u.ip = mEmitted;
        }
        break;

      default:
        // Not a % token after all... skip it
        if (!emit("%", 1)) return false;
        if (!emit(fmt - 1, 1)) return false;
    }
  }

  return true;
}

/************************************************************************/

bool mozilla::PrintfTarget::print(const char* format, ...) {
  va_list ap;

  va_start(ap, format);
  bool result = vprint(format, ap);
  va_end(ap);
  return result;
}

#undef TYPE_SHORT
#undef TYPE_USHORT
#undef TYPE_INTN
#undef TYPE_UINTN
#undef TYPE_LONG
#undef TYPE_ULONG
#undef TYPE_LONGLONG
#undef TYPE_ULONGLONG
#undef TYPE_STRING
#undef TYPE_DOUBLE
#undef TYPE_INTSTR
#undef TYPE_POINTER
#undef TYPE_WSTRING
#undef TYPE_UNKNOWN

#undef FLAG_LEFT
#undef FLAG_SIGNED
#undef FLAG_SPACED
#undef FLAG_ZEROS
#undef FLAG_NEG