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- /*
- Copyright (C) 1993 Free Software Foundation
-
- This file is part of the GNU IO Library. This library is free
- software; you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU CC; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- As a special exception, if you link this library with files
- compiled with a GNU compiler to produce an executable, this does not cause
- the resulting executable to be covered by the GNU General Public License.
- This exception does not however invalidate any other reasons why
- the executable file might be covered by the GNU General Public License. */
-
- #include <stdarg.h>
- #include "libioP.h"
- #include "stream.h"
- #include "strstream.h"
-
- #if defined(atarist)
- #undef _IO_BUFSIZ
- #define _IO_BUFSIZ 1024
- #endif
-
- static char Buffer[_IO_BUFSIZ];
- #define EndBuffer (Buffer+_IO_BUFSIZ)
- static char* next_chunk = Buffer; // Start of available part of Buffer.
-
- char* form(const char* format, ...)
- {
- int space_left = EndBuffer - next_chunk;
- // If less that 25% of the space is available start over.
- if (space_left < (_IO_BUFSIZ>>2))
- next_chunk = Buffer;
- char* buf = next_chunk;
-
- strstreambuf stream(buf, EndBuffer-buf-1, buf);
- va_list ap;
- va_start(ap, format);
- int count = stream.vform(format, ap);
- va_end(ap);
- stream.sputc(0);
- next_chunk = buf + stream.pcount();
- return buf;
- }
-
- #define u_long unsigned long
-
- static char* itoa(unsigned long i, int size, int neg, int base)
- {
- // Conservative estimate: If base==2, might need 8 characters
- // for each input byte, but normally 3 is plenty.
- int needed = size ? size
- : (base >= 8 ? 3 : 8) * sizeof(unsigned long) + 2;
- int space_left = EndBuffer - next_chunk;
- if (space_left <= needed)
- next_chunk = Buffer; // start over.
-
- char* buf = next_chunk;
-
- register char* ptr = buf+needed+1;
- next_chunk = ptr;
-
- if (needed < (2+neg) || ptr > EndBuffer)
- return NULL;
- *--ptr = 0;
-
- if (i == 0)
- *--ptr = '0';
- while (i != 0 && ptr > buf) {
- int ch = i % base;
- i = i / base;
- if (ch >= 10)
- ch += 'a' - 10;
- else
- ch += '0';
- *--ptr = ch;
- }
- if (neg)
- *--ptr = '-';
- if (size == 0)
- return ptr;
- while (ptr > buf)
- *--ptr = ' ';
- return buf;
- }
-
- char* dec(long i, int len /* = 0 */)
- {
- if (i >= 0) return itoa((unsigned long)i, len, 0, 10);
- else return itoa((unsigned long)(-i), len, 1, 10);
- }
- char* dec(int i, int len /* = 0 */)
- {
- if (i >= 0) return itoa((unsigned long)i, len, 0, 10);
- else return itoa((unsigned long)(-i), len, 1, 10);
- }
- char* dec(unsigned long i, int len /* = 0 */)
- {
- return itoa(i, len, 0, 10);
- }
- char* dec(unsigned int i, int len /* = 0 */)
- {
- return itoa(i, len, 0, 10);
- }
-
- char* hex(long i, int len /* = 0 */)
- {
- return itoa((unsigned long)i, len, 0, 16);
- }
- char* hex(int i, int len /* = 0 */)
- {
- return itoa((unsigned long)i, len, 0, 16);
- }
- char* hex(unsigned long i, int len /* = 0 */)
- {
- return itoa(i, len, 0, 16);
- }
- char* hex(unsigned int i, int len /* = 0 */)
- {
- return itoa(i, len, 0, 16);
- }
-
- char* oct(long i, int len /* = 0 */)
- {
- return itoa((unsigned long)i, len, 0, 8);
- }
- char* oct(int i, int len /* = 0 */)
- {
- return itoa((unsigned long)i, len, 0, 8);
- }
- char* oct(unsigned long i, int len /* = 0 */)
- {
- return itoa(i, len, 0, 8);
- }
- char* oct(unsigned int i, int len /* = 0 */)
- {
- return itoa(i, len, 0, 8);
- }
-