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86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
/* Type-generic wrapper for readdir functions.
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Copyright (C) 2024-2025 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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#ifndef SUPPORT_READDIR_H
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#define SUPPORT_READDIR_H
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#include <dirent.h>
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#include <stdbool.h>
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#include <stdint.h>
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__BEGIN_DECLS
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/* Definition independent of _FILE_OFFSET_BITS. */
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struct support_dirent
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{
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uint64_t d_ino;
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uint64_t d_off; /* 0 if d_off is not supported. */
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uint32_t d_type;
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char *d_name;
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};
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/* Operation to be performed by support_readdir below. */
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enum support_readdir_op
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{
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SUPPORT_READDIR,
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SUPPORT_READDIR64,
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SUPPORT_READDIR_R,
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SUPPORT_READDIR64_R,
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SUPPORT_READDIR64_COMPAT,
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SUPPORT_READDIR64_R_COMPAT,
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};
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/* Returns the last supported function. May exclude
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SUPPORT_READDIR64_R_COMPAT if not implemented. */
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enum support_readdir_op support_readdir_op_last (void);
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/* Returns the name of the function that corresponds to the OP constant. */
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const char *support_readdir_function (enum support_readdir_op op);
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/* Returns the d_ino field width for OP, in bits. */
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unsigned int support_readdir_inode_width (enum support_readdir_op op);
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/* Returns the d_off field width for OP, in bits. Zero if not present. */
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unsigned int support_readdir_offset_width (enum support_readdir_op op);
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/* Returns true if OP is an _r variant with name length restrictions. */
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bool support_readdir_r_variant (enum support_readdir_op op);
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/* First, free E->d_name and set the field to NULL. Then call the
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readdir variant as specified by OP. If successfully, copy fields
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to E, make a copy of the entry name using strdup, and write its
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addres sto E->d_name.
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Return true if an entry was read, or false if the end of the
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directory stream was reached. Terminates the process upon error.
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The caller is expected to free E->d_name if the function is not
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called again for this E.
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Note that this function assumes that E->d_name has been initialized
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to NULL or has been allocated by a previous call to this function. */
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bool support_readdir (DIR *stream, enum support_readdir_op op,
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struct support_dirent *e) __nonnull ((1, 3));
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/* Checks that the readdir operation OP fails with errno value EXPECTED. */
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void support_readdir_expect_error (DIR *stream, enum support_readdir_op op,
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int expected) __nonnull ((1));
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__END_DECLS
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#endif /* SUPPORT_READDIR_H */
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