/* Like vsprintf but provides a pointer to malloc'd storage, which must be freed by the caller. Copyright (C) 1994, 2002 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <stdio.h> #include <string.h> #include <stdlib.h> #include <stdarg.h> #ifndef va_copy /* According to POSIX, va_copy is a macro. */ #if defined (__GNUC__) && defined (__PPC__) \ && (defined (_CALL_SYSV) || defined (_WIN32)) #define va_copy(d, s) (*(d) = *(s)) #elif defined (MUST_COPY_VA_BYVAL) #define va_copy(d, s) ((d) = (s)) #else #define va_copy(d, s) memcpy ((d), (s), sizeof (va_list)) #endif #endif #ifdef TEST int global_total_width; #endif static int int_vasprintf (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; va_copy (ap, *args); 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': { char *tmp = va_arg (ap, char *); if (tmp) total_width += strlen (tmp); else /* in case the vsprintf does prints a text */ total_width += 25; /* e.g. "(null pointer reference)" */ } 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); } int asprintf (char **buf, const char *fmt, ...) { int status; va_list ap; va_start (ap, fmt); status = vasprintf (buf, fmt, ap); va_end (ap); return status; } #ifdef TEST void checkit (const char* format, ...) { va_list args; char *result; va_start (args, format); vasprintf (&result, format, args); if (strlen (result) < global_total_width) printf ("PASS: "); else printf ("FAIL: "); printf ("%d %s\n", global_total_width, result); } int main (void) { 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"); } #endif /* TEST */