Alejandro Colomar
8821d3ff2d
Fixes: 419ce14b6f (2024-11-01, "lib/fs/readlink/: readlinknul(): Add function")
Cc: Serge Halyn <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
54 lines
971 B
C
54 lines
971 B
C
// SPDX-FileCopyrightText: 2024, Alejandro Colomar <alx@kernel.org>
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// SPDX-License-Identifier: BSD-3-Clause
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#ifndef SHADOW_INCLUDE_LIB_FS_READLINK_READLINKNUL_H_
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#define SHADOW_INCLUDE_LIB_FS_READLINK_READLINKNUL_H_
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#include <config.h>
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#include <errno.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "attr.h"
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#include "sizeof.h"
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#define READLINKNUL(link, buf) readlinknul(link, buf, NITEMS(buf))
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ATTR_STRING(1)
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inline ssize_t readlinknul(const char *restrict link, char *restrict buf,
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size_t size);
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// Similar to readlink(2), but terminate the string.
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inline ssize_t
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readlinknul(const char *restrict link, char *restrict buf, size_t size)
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{
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size_t ulen;
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ssize_t slen;
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slen = readlink(link, buf, size);
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if (slen == -1)
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return -1;
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ulen = slen;
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if (ulen == size) {
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stpcpy(&buf[size-1], "");
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errno = E2BIG;
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return -1;
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}
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stpcpy(&buf[ulen], "");
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return slen;
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}
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#endif // include guard
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