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libcamera: utils: Add strlcpy

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strlcpy is available in libbsd, bionic, musl, and ulibc, but not in glibc.
Instead of checking for strlcpy availability and modifying dependencies,
implement it in utils, as a wrapper around strncpy.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Paul Elder 2020-01-03 15:52:19 -05:00
parent 1acad98f7d
commit 4910ff05c0
2 changed files with 25 additions and 0 deletions
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3
src/libcamera/include/utils.h
View file

@ -12,6 +12,7 @@
#include <memory>
#include <ostream>
#include <string>
#include <string.h>
#include <sys/time.h>
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
@ -112,6 +113,8 @@ inline _hex hex<uint64_t>(uint64_t value, unsigned int width)
}
#endif
size_t strlcpy(char *dst, const char *src, size_t size);
} /* namespace utils */
} /* namespace libcamera */

22
src/libcamera/utils.cpp
View file

@ -182,6 +182,28 @@ operator<<(std::basic_ostream<char, std::char_traits<char>> &stream, const _hex
* otherwise. The \a os stream configuration is not modified.
*/
/**
* \brief Copy a string with a size limit
* \param[in] dst The destination string
* \param[in] src The source string
* \param[in] size The size of the destination string
*
* This function copies the null-terminated string \a src to \a dst with a limit
* of \a size - 1 characters, and null-terminates the result if \a size is
* larger than 0. If \a src is larger than \a size - 1, \a dst is truncated.
*
* \return The size of \a src
*/
size_t strlcpy(char *dst, const char *src, size_t size)
{
if (size) {
strncpy(dst, src, size);
dst[size - 1] = '\0';
}
return strlen(src);
}
} /* namespace utils */
} /* namespace libcamera */