| 1 | /* Invoke a printf specifier handler. Generic version. |
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| 2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <array_length.h> |
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| 20 | |
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| 21 | int |
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| 22 | Xprintf (function_invoke) (void *buf, |
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| 23 | printf_function callback, |
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| 24 | union printf_arg *args_value, |
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| 25 | size_t ndata_args, |
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| 26 | struct printf_info *info) |
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| 27 | { |
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| 28 | /* Most custom specifiers expect just one argument. Use the heap |
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| 29 | for larger argument arrays. */ |
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| 30 | const void *onstack_args[4]; |
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| 31 | const void **args; |
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| 32 | if (ndata_args <= array_length (onstack_args)) |
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| 33 | args = onstack_args; |
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| 34 | else |
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| 35 | { |
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| 36 | args = calloc (nmemb: ndata_args, size: sizeof (*args)); |
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| 37 | if (args == NULL) |
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| 38 | return -1; |
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| 39 | } |
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| 40 | |
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| 41 | for (unsigned int i = 0; i < ndata_args; ++i) |
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| 42 | args[i] = &args_value[i]; |
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| 43 | |
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| 44 | struct Xprintf (buffer_as_file) s; |
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| 45 | Xprintf (buffer_as_file_init) (fp: &s, next: buf); |
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| 46 | |
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| 47 | /* Call the function. */ |
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| 48 | int done = callback (Xprintf (buffer_as_file_get) (file: &s), info, args); |
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| 49 | |
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| 50 | if (!Xprintf (buffer_as_file_terminate) (&s)) |
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| 51 | done = -1; |
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| 52 | |
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| 53 | if (args != onstack_args) |
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| 54 | free (ptr: args); |
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| 55 | |
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| 56 | /* Potential error from the callback function. */ |
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| 57 | return done; |
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| 58 | } |
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| 59 | |
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