156 lines
3.6 KiB
C
156 lines
3.6 KiB
C
/* Like vsprintf but provides a pointer to malloc'd storage, which must
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be freed by the caller.
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Copyright (C) 1994, 2002 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#ifdef TEST
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int global_total_width;
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#endif
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int
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vasprintf (char **result, const char *format, va_list *args)
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{
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const char *p = format;
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/* Add one to make sure that it is never zero, which might cause malloc
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to return NULL. */
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int total_width = strlen (format) + 1;
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va_list ap;
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/* FIXME: use va_copy() */
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memcpy (&ap, args, sizeof (va_list));
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while (*p != '\0')
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{
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if (*p++ == '%')
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{
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while (strchr ("-+ #0", *p))
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++p;
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if (*p == '*')
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{
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++p;
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total_width += abs (va_arg (ap, int));
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}
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else
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total_width += strtoul (p, (char**)&p, 10);
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if (*p == '.')
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{
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++p;
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if (*p == '*')
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{
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++p;
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total_width += abs (va_arg (ap, int));
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}
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else
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total_width += strtoul (p, (char**)&p, 10);
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}
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while (strchr ("hlL", *p))
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++p;
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/* Should be big enough for any format specifier except %s and floats. */
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total_width += 30;
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switch (*p)
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{
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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case 'c':
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(void) va_arg (ap, int);
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break;
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case 'f':
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case 'e':
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case 'E':
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case 'g':
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case 'G':
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(void) va_arg (ap, double);
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/* Since an ieee double can have an exponent of 307, we'll
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make the buffer wide enough to cover the gross case. */
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total_width += 307;
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break;
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case 's':
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total_width += strlen (va_arg (ap, char *));
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break;
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case 'p':
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case 'n':
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(void) va_arg (ap, char *);
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break;
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}
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}
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}
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#ifdef TEST
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global_total_width = total_width;
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#endif
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*result = malloc (total_width);
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if (*result != NULL)
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return vsprintf (*result, format, *args);
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else
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return 0;
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}
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int
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asprintf (char **buf, const char *fmt, ...)
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{
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int status;
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va_list ap;
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va_start (ap, fmt);
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status = vasprintf (buf, fmt, ap);
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va_end (ap);
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return status;
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}
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#ifdef TEST
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void
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checkit (const char* format, ...)
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{
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va_list args;
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char *result;
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va_start (args, format);
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vasprintf (&result, format, args);
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if (strlen (result) < global_total_width)
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printf ("PASS: ");
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else
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printf ("FAIL: ");
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printf ("%d %s\n", global_total_width, result);
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}
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int
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main (void)
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{
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checkit ("%d", 0x12345678);
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checkit ("%200d", 5);
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checkit ("%.300d", 6);
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checkit ("%100.150d", 7);
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checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
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777777777777777777333333333333366666666666622222222222777777777777733333");
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checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
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}
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#endif /* TEST */
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