[Libguestfs] [p2v PATCH v2 03/11] guestfs-utils: import guestfs_int_join_strings()

Copy the guestfs_int_join_strings() function from libguestfs-common @ 3253cd99d135 ("mldrivers: Add support for reading Windows drivers from DriverDatabase", 2023-01-26). Cc: Alban Lecorps <alban.lecorps(a)ubisoft.com&gt; Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1792141 Signed-off-by: Laszlo Ersek <lersek(a)redhat.com&gt; Reviewed-by: Richard W.M. Jones <rjones(a)redhat.com&gt; --- libguestfs/guestfs-utils.h | 1 + libguestfs/guestfs-utils.c | 35 ++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/libguestfs/guestfs-utils.h b/libguestfs/guestfs-utils.h index d5557a49680c..62402ccdd202 100644 --- a/libguestfs/guestfs-utils.h +++ b/libguestfs/guestfs-utils.h @@ -48,6 +48,7 @@ extern void guestfs_int_free_string_list (char **); extern size_t guestfs_int_count_strings (char *const *); extern char **guestfs_int_copy_string_list (char *const *); +extern char *guestfs_int_join_strings (const char *sep, char *const *); extern char **guestfs_int_split_string (char sep, const char *); extern int guestfs_int_random_string (char *ret, size_t len); extern char *guestfs_int_drive_name (size_t index, char *ret); diff --git a/libguestfs/guestfs-utils.c b/libguestfs/guestfs-utils.c index 505c9f6c0a32..9f0b012d2968 100644 --- a/libguestfs/guestfs-utils.c +++ b/libguestfs/guestfs-utils.c @@ -77,6 +77,41 @@ guestfs_int_copy_string_list (char *const *argv) return ret; } +char * +guestfs_int_join_strings (const char *sep, char *const *argv) +{ + size_t i, len, seplen, rlen; + char *r; + + seplen = strlen (sep); + + len = 0; + for (i = 0; argv[i] != NULL; ++i) { + if (i > 0) + len += seplen; + len += strlen (argv[i]); + } + len++; /* for final \0 */ + + r = malloc (len); + if (r == NULL) + return NULL; + + rlen = 0; + for (i = 0; argv[i] != NULL; ++i) { + if (i > 0) { + memcpy (&r[rlen], sep, seplen); + rlen += seplen; + } + len = strlen (argv[i]); + memcpy (&r[rlen], argv[i], len); + rlen += len; + } + r[rlen] = '\0'; + + return r; +} + /** * Split string at separator character C<sep>, returning the list of * strings. Returns C<NULL> on memory allocation failure.