182 lines
4.0 KiB
C
182 lines
4.0 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, 1998, 1999, 2000-2003 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, 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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/* Specification. */
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#include "vasprintf.h"
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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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#include <math.h>
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#ifdef TEST
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size_t global_total_width;
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#endif
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static int
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int_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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size_t total_width = strlen (format) + 1;
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va_list ap = *args;
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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 ("hlLjtz", *p))
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++p;
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/* Should be big enough for any format specifier except %s
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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 'F':
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{
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double arg = va_arg (ap, double);
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if (arg >= 1.0 || arg <= -1.0)
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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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}
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break;
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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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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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p++;
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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 -1;
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}
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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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return int_vasprintf (result, format, &args);
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}
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int
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asprintf (char **result, const char *format, ...)
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{
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va_list args;
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int done;
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va_start (args, format);
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done = vasprintf (result, format, args);
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va_end (args);
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return done;
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}
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/* ========================= test program ========================= */
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#ifdef TEST
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#include <float.h>
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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 ("%lu %s\n", (unsigned long) global_total_width, result);
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}
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int
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main ()
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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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checkit ("%e", DBL_MIN);
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checkit ("%e", DBL_MAX);
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checkit ("%.400f", DBL_MIN);
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checkit ("%f", DBL_MAX);
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checkit ("%g", DBL_MIN);
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checkit ("%g", DBL_MAX);
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return 0;
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}
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#endif /* TEST */
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