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Diffstat (limited to 'gcc-4.7/libiberty/vasprintf.c')
| -rw-r--r-- | gcc-4.7/libiberty/vasprintf.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/gcc-4.7/libiberty/vasprintf.c b/gcc-4.7/libiberty/vasprintf.c new file mode 100644 index 000000000..85de5429f --- /dev/null +++ b/gcc-4.7/libiberty/vasprintf.c @@ -0,0 +1,197 @@ +/* Like vsprintf but provides a pointer to malloc'd storage, which must + be freed by the caller. + Copyright (C) 1994, 2003, 2011 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 <ansidecl.h> +#include <stdarg.h> +#if !defined (va_copy) && defined (__va_copy) +# define va_copy(d,s) __va_copy((d),(s)) +#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, minus one is returned and @code{NULL} is stored in +@code{*@var{resptr}}. + +@end deftypefn + +*/ + +static int int_vasprintf (char **, const char *, va_list); + +static int +int_vasprintf (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; + +#ifdef va_copy + va_copy (ap, args); +#else + memcpy ((PTR) &ap, (PTR) &args, sizeof (va_list)); +#endif + + 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 va_copy + va_end (ap); +#endif +#ifdef TEST + global_total_width = total_width; +#endif + *result = (char *) malloc (total_width); + if (*result != NULL) + return vsprintf (*result, format, args); + else + return -1; +} + +int +vasprintf (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 (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 (void); + +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"); + + return 0; +} +#endif /* TEST */ |