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c7bf2e99ca
And __wprintf_function_invoke. These functions will be used to to call registered printf specifier callbacks on printf buffers after vfprintf and vfwprintf have been converted to buffers. The new implementation avoids alloca/variable length arrays. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* Invoke a printf specifier handler. Generic version.
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Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <array_length.h>
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int
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Xprintf (function_invoke) (void *buf,
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printf_function callback,
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union printf_arg *args_value,
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size_t ndata_args,
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struct printf_info *info)
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{
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/* Most custom specifiers expect just one argument. Use the heap
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for larger argument arrays. */
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const void *onstack_args[4];
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const void **args;
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if (ndata_args <= array_length (onstack_args))
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args = onstack_args;
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else
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{
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args = calloc (ndata_args, sizeof (*args));
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if (args == NULL)
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return -1;
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}
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for (unsigned int i = 0; i < ndata_args; ++i)
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args[i] = &args_value[i];
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struct Xprintf (buffer_as_file) s;
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Xprintf (buffer_as_file_init) (&s, buf);
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/* Call the function. */
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int done = callback (Xprintf (buffer_as_file_get) (&s), info, args);
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if (!Xprintf (buffer_as_file_terminate) (&s))
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done = -1;
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if (args != onstack_args)
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free (args);
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/* Potential error from the callback function. */
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return done;
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}
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