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glibc-2.35
libio/obprintf.c
194 строки
5 KB
Paul Eggert
Update copyright dates with scripts/update-copyrights
01 янв 2022, 22:40
01 янв 2022, 22:40
581c785
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/* Print output of stream to given obstack. Copyright (C) 1996-2022 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #include <stdlib.h> #include "libioP.h" #include "strfile.h" #include <assert.h> #include <string.h> #include <errno.h> #include <obstack.h> #include <stdarg.h> #include <stdio_ext.h> struct _IO_obstack_file { struct _IO_FILE_plus file; struct obstack *obstack; }; static int _IO_obstack_overflow (FILE *fp, int c) { struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack; int size; /* Make room for another character. This might as well allocate a new chunk a memory and moves the old contents over. */ assert (c != EOF); obstack_1grow (obstack, c); /* Setup the buffer pointers again. */ fp->_IO_write_base = obstack_base (obstack); fp->_IO_write_ptr = obstack_next_free (obstack); size = obstack_room (obstack); fp->_IO_write_end = fp->_IO_write_ptr + size; /* Now allocate the rest of the current chunk. */ obstack_blank_fast (obstack, size); return c; } static size_t _IO_obstack_xsputn (FILE *fp, const void *data, size_t n) { struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack; if (fp->_IO_write_ptr + n > fp->_IO_write_end) { int size; /* We need some more memory. First shrink the buffer to the space we really currently need. */ obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end); /* Now grow for N bytes, and put the data there. */ obstack_grow (obstack, data, n); /* Setup the buffer pointers again. */ fp->_IO_write_base = obstack_base (obstack); fp->_IO_write_ptr = obstack_next_free (obstack); size = obstack_room (obstack); fp->_IO_write_end = fp->_IO_write_ptr + size; /* Now allocate the rest of the current chunk. */ obstack_blank_fast (obstack, size); } else fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n); return n; } /* the jump table. */ const struct _IO_jump_t _IO_obstack_jumps libio_vtable attribute_hidden = { JUMP_INIT_DUMMY, JUMP_INIT(finish, NULL), JUMP_INIT(overflow, _IO_obstack_overflow), JUMP_INIT(underflow, NULL), JUMP_INIT(uflow, NULL), JUMP_INIT(pbackfail, NULL), JUMP_INIT(xsputn, _IO_obstack_xsputn), JUMP_INIT(xsgetn, NULL), JUMP_INIT(seekoff, NULL), JUMP_INIT(seekpos, NULL), JUMP_INIT(setbuf, NULL), JUMP_INIT(sync, NULL), JUMP_INIT(doallocate, NULL), JUMP_INIT(read, NULL), JUMP_INIT(write, NULL), JUMP_INIT(seek, NULL), JUMP_INIT(close, NULL), JUMP_INIT(stat, NULL), JUMP_INIT(showmanyc, NULL), JUMP_INIT(imbue, NULL) }; int __obstack_vprintf_internal (struct obstack *obstack, const char *format, va_list args, unsigned int mode_flags) { struct obstack_FILE { struct _IO_obstack_file ofile; } new_f; int result; int size; int room; #ifdef _IO_MTSAFE_IO new_f.ofile.file.file._lock = NULL; #endif _IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL); _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps; room = obstack_room (obstack); size = obstack_object_size (obstack) + room; if (size == 0) { /* We have to handle the allocation a bit different since the `_IO_str_init_static' function would handle a size of zero different from what we expect. */ /* Get more memory. */ obstack_make_room (obstack, 64); /* Recompute how much room we have. */ room = obstack_room (obstack); size = room; assert (size != 0); } _IO_str_init_static_internal ((struct _IO_strfile_ *) &new_f.ofile, obstack_base (obstack), size, obstack_next_free (obstack)); /* Now allocate the rest of the current chunk. */ assert (size == (new_f.ofile.file.file._IO_write_end - new_f.ofile.file.file._IO_write_base)); assert (new_f.ofile.file.file._IO_write_ptr == (new_f.ofile.file.file._IO_write_base + obstack_object_size (obstack))); obstack_blank_fast (obstack, room); new_f.ofile.obstack = obstack; result = __vfprintf_internal (&new_f.ofile.file.file, format, args, mode_flags); /* Shrink the buffer to the space we really currently need. */ obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr - new_f.ofile.file.file._IO_write_end)); return result; } int __obstack_vprintf (struct obstack *obstack, const char *format, va_list ap) { return __obstack_vprintf_internal (obstack, format, ap, 0); } ldbl_weak_alias (__obstack_vprintf, obstack_vprintf) int __obstack_printf (struct obstack *obstack, const char *format, ...) { int result; va_list ap; va_start (ap, format); result = __obstack_vprintf_internal (obstack, format, ap, 0); va_end (ap); return result; } ldbl_weak_alias (__obstack_printf, obstack_printf)