/* Like vsprintf but provides a pointer to malloc'd storage, which must be freed by the caller. Copyright (C) 1994 Free Software Foundation, Inc. This file is part of the libiberty library. Libiberty is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Libiberty 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with libiberty; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <ansidecl.h> #ifdef ANSI_PROTOTYPES #include <stdarg.h> #else #include <varargs.h> #endif #include <stdio.h> #ifdef HAVE_STRING_H #include <string.h> #endif #ifdef HAVE_STDLIB_H #include <stdlib.h> #else extern unsigned long strtoul (); extern PTR malloc (); #endif #include "libiberty.h" #ifdef TEST int global_total_width; #endif /* @deftypefn Extension int vasprintf (char **@var{resptr}, const char *@var{format}, va_list @var{args}) Like @code{vsprintf}, but instead of passing a pointer to a buffer, you pass a pointer to a pointer. This function will compute the size of the buffer needed, allocate memory with @code{malloc}, and store a pointer to the allocated memory in @code{*@var{resptr}}. The value returned is the same as @code{vsprintf} would return. If memory could not be allocated, zero is returned and @code{NULL} is stored in @code{*@var{resptr}}. @end deftypefn */ static int int_vasprintf PARAMS ((char **, const char *, va_list *)); static int int_vasprintf (result, format, args) char **result; const char *format; va_list *args; { const char *p = format; /* Add one to make sure that it is never zero, which might cause malloc to return NULL. */ int total_width = strlen (format) + 1; va_list ap; memcpy ((PTR) &ap, (PTR) args, sizeof (va_list)); while (*p != '\0') { if (*p++ == '%') { while (strchr ("-+ #0", *p)) ++p; if (*p == '*') { ++p; total_width += abs (va_arg (ap, int)); } else total_width += strtoul (p, (char **) &p, 10); if (*p == '.') { ++p; if (*p == '*') { ++p; total_width += abs (va_arg (ap, int)); } else total_width += strtoul (p, (char **) &p, 10); } while (strchr ("hlL", *p)) ++p; /* Should be big enough for any format specifier except %s and floats. */ total_width += 30; switch (*p) { case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': case 'c': (void) va_arg (ap, int); break; case 'f': case 'e': case 'E': case 'g': case 'G': (void) va_arg (ap, double); /* Since an ieee double can have an exponent of 307, we'll make the buffer wide enough to cover the gross case. */ total_width += 307; break; case 's': total_width += strlen (va_arg (ap, char *)); break; case 'p': case 'n': (void) va_arg (ap, char *); break; } p++; } } #ifdef TEST global_total_width = total_width; #endif *result = malloc (total_width); if (*result != NULL) return vsprintf (*result, format, *args); else return 0; } int vasprintf (result, format, args) char **result; const char *format; #if defined (_BSD_VA_LIST_) && defined (__FreeBSD__) _BSD_VA_LIST_ args; #else va_list args; #endif { return int_vasprintf (result, format, &args); } #ifdef TEST static void ATTRIBUTE_PRINTF_1 checkit VPARAMS ((const char *format, ...)) { char *result; VA_OPEN (args, format); VA_FIXEDARG (args, const char *, format); vasprintf (&result, format, args); VA_CLOSE (args); if (strlen (result) < (size_t) global_total_width) printf ("PASS: "); else printf ("FAIL: "); printf ("%d %s\n", global_total_width, result); free (result); } extern int main PARAMS ((void)); int main () { checkit ("%d", 0x12345678); checkit ("%200d", 5); checkit ("%.300d", 6); checkit ("%100.150d", 7); checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\ 777777777777777777333333333333366666666666622222222222777777777777733333"); checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx"); return 0; } #endif /* TEST */