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utils: Implement strlcpy() and strlcat() 

By making use of strncpy(), both implementations are really simple so
there is no need to add libbsd as additional dependency.

Signed-off-by: Phil Sutter <phil@nwl.cc>
This commit is contained in:
Phil Sutter 2017-09-01 18:52:51 +02:00 committed by Stephen Hemminger
parent 50f81afd4d
commit 8d15e012a3
2 changed files with 22 additions and 0 deletions
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3
include/utils.h
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@ -251,4 +251,7 @@ int make_path(const char *path, mode_t mode);
char *find_cgroup2_mount(void);
int get_command_name(const char *pid, char *comm, size_t len);
size_t strlcpy(char *dst, const char *src, size_t size);
size_t strlcat(char *dst, const char *src, size_t size);
#endif /* __UTILS_H__ */

19
lib/utils.c
View File

@ -1230,3 +1230,22 @@ int get_real_family(int rtm_type, int rtm_family)
return rtm_family;
}
size_t strlcpy(char *dst, const char *src, size_t size)
{
if (size) {
strncpy(dst, src, size - 1);
dst[size - 1] = '\0';
}
return strlen(src);
}
size_t strlcat(char *dst, const char *src, size_t size)
{
size_t dlen = strlen(dst);
if (dlen > size)
return dlen + strlen(src);
return dlen + strlcpy(dst + dlen, src, size - dlen);
}