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133 lines
3.4 KiB
133 lines
3.4 KiB
/* 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, 2003 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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#include <stdarg.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "vasprintf.h" |
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/* |
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@deftypefn Extension int vasprintf (char **@var{resptr}, const char *@var{format}, va_list @var{args}) |
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Like @code{vsprintf}, but instead of passing a pointer to a buffer, |
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you pass a pointer to a pointer. This function will compute the size |
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of the buffer needed, allocate memory with @code{malloc}, and store a |
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pointer to the allocated memory in @code{*@var{resptr}}. The value |
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returned is the same as @code{vsprintf} would return. If memory could |
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not be allocated, minus one is returned and @code{NULL} is stored in |
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@code{*@var{resptr}}. |
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@end deftypefn |
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*/ |
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static int int_vasprintf(char **, const char *, va_list); |
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static int |
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int_vasprintf (result, format, args) |
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char **result; |
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const char *format; |
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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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memcpy ((void *) &ap, (const void *) &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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p++; |
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} |
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} |
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*result = (char *) 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 (result, format, args) |
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char **result; |
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const char *format; |
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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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