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eal: support strlcat function

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Add the strlcat function to DPDK to exist alongside the strlcpy one.
While strncat is generally safe for use for concatenation, the API for the
strlcat function is perhaps a little nicer to use, and supports truncation
detection.

See commit 5364de644a4b ("eal: support strlcpy function") for more
details on the function selection logic, since we only should be using the
DPDK-provided version when no system-provided version is present.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
This commit is contained in:
Bruce Richardson 2019-01-17 17:30:32 +00:00 committed by Thomas Monjalon
parent 0b8572a0c1
commit 146e57627f
2 changed files with 61 additions and 0 deletions
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16
lib/librte_eal/common/include/rte_string_fns.h
View File

@ -59,10 +59,25 @@ rte_strlcpy(char *dst, const char *src, size_t size)
return (size_t)snprintf(dst, size, "%s", src);
}
/**
* @internal
* DPDK-specific version of strlcat for systems without
* libc or libbsd copies of the function
*/
static inline size_t
rte_strlcat(char *dst, const char *src, size_t size)
{
size_t l = strnlen(dst, size);
if (l < size)
return l + rte_strlcpy(&dst[l], src, size - l);
return l + strlen(src);
}
/* pull in a strlcpy function */
#ifdef RTE_EXEC_ENV_BSDAPP
#ifndef __BSD_VISIBLE /* non-standard functions are hidden */
#define strlcpy(dst, src, size) rte_strlcpy(dst, src, size)
#define strlcat(dst, src, size) rte_strlcat(dst, src, size)
#endif
#else /* non-BSD platforms */
@ -71,6 +86,7 @@ rte_strlcpy(char *dst, const char *src, size_t size)
#else /* no BSD header files, create own */
#define strlcpy(dst, src, size) rte_strlcpy(dst, src, size)
#define strlcat(dst, src, size) rte_strlcat(dst, src, size)
#endif /* RTE_USE_LIBBSD */
#endif /* BSDAPP */

45
test/test/test_string_fns.c
View File

@ -129,11 +129,56 @@ test_rte_strsplit(void)
return 0;
}
static int
test_rte_strlcat(void)
{
/* only run actual unit tests if we have system-provided strlcat */
#if defined(__BSD_VISIBLE) || defined(RTE_USE_LIBBSD)
#define BUF_LEN 32
const char dst[BUF_LEN] = "Test string";
const char src[] = " appended";
char bsd_dst[BUF_LEN];
char rte_dst[BUF_LEN];
size_t i, bsd_ret, rte_ret;
LOG("dst = '%s', strlen(dst) = %zu\n", dst, strlen(dst));
LOG("src = '%s', strlen(src) = %zu\n", src, strlen(src));
LOG("---\n");
for (i = 0; i < BUF_LEN; i++) {
/* initialize destination buffers */
memcpy(bsd_dst, dst, BUF_LEN);
memcpy(rte_dst, dst, BUF_LEN);
/* compare implementations */
bsd_ret = strlcat(bsd_dst, src, i);
rte_ret = rte_strlcat(rte_dst, src, i);
if (bsd_ret != rte_ret) {
LOG("Incorrect retval for buf length = %zu\n", i);
LOG("BSD: '%zu', rte: '%zu'\n", bsd_ret, rte_ret);
return -1;
}
if (memcmp(bsd_dst, rte_dst, BUF_LEN) != 0) {
LOG("Resulting buffers don't match\n");
LOG("BSD: '%s', rte: '%s'\n", bsd_dst, rte_dst);
return -1;
}
LOG("buffer size = %zu: dst = '%s', ret = %zu\n",
i, rte_dst, rte_ret);
}
LOG("Checked %zu combinations\n", i);
#undef BUF_LEN
#endif /* defined(__BSD_VISIBLE) || defined(RTE_USE_LIBBSD) */
return 0;
}
static int
test_string_fns(void)
{
if (test_rte_strsplit() < 0)
return -1;
if (test_rte_strlcat() < 0)
return -1;
return 0;
}