diff options
| author | Junio C Hamano <gitster@pobox.com> | 2025-08-01 15:04:19 -0700 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2025-08-02 22:33:12 -0700 |
| commit | 527535fcdd2d9dec56877435f609852d0f2bf163 (patch) | |
| tree | 6b4659ef3e35df1f0570d105925c4d266dcc348a | |
| parent | 9f6dfe43c8a55b833ae16486bcafe29b543461f9 (diff) | |
| download | git-527535fcdd2d9dec56877435f609852d0f2bf163.tar.gz | |
string-list: unify string_list_split* functions
Thanks to the previous step, the only difference between these two
related functions is that string_list_split() works on a string
without modifying its contents (i.e. taking "const char *") and the
resulting pieces of strings are their own copies in a string list,
while string_list_split_in_place() works on a mutable string and the
resulting pieces of strings come from the original string.
Consolidate their implementations into a single helper function, and
make them a thin wrapper around it. We can later add an extra flags
parameter to extend both of these functions by updating only the
internal helper function.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
| -rw-r--r-- | string-list.c | 96 |
1 files changed, 56 insertions, 40 deletions
diff --git a/string-list.c b/string-list.c index 2284a009cb..65b6ceb259 100644 --- a/string-list.c +++ b/string-list.c @@ -276,55 +276,71 @@ void unsorted_string_list_delete_item(struct string_list *list, int i, int free_ list->nr--; } -int string_list_split(struct string_list *list, const char *string, - const char *delim, int maxsplit) +/* + * append a substring [p..end] to list; return number of things it + * appended to the list. + */ +static int append_one(struct string_list *list, + const char *p, const char *end, + int in_place) +{ + if (!end) + end = p + strlen(p); + + if (in_place) { + *((char *)end) = '\0'; + string_list_append(list, p); + } else { + string_list_append_nodup(list, xmemdupz(p, end - p)); + } + return 1; +} + +/* + * Unfortunately this cannot become a public interface, as _in_place() + * wants to have "const char *string" while the other variant wants to + * have "char *string" for type safety. + * + * This accepts "const char *string" to allow both wrappers to use it; + * it internally casts away the constness when in_place is true by + * taking advantage of strpbrk() that takes a "const char *" arg and + * returns "char *" pointer into that const string. Yucky but works ;-). + */ +static int split_string(struct string_list *list, const char *string, const char *delim, + int maxsplit, int in_place) { int count = 0; - const char *p = string, *end; + const char *p = string; + + if (in_place && list->strdup_strings) + BUG("string_list_split_in_place() called with strdup_strings"); + else if (!in_place && !list->strdup_strings) + BUG("string_list_split() called without strdup_strings"); - if (!list->strdup_strings) - BUG("internal error in string_list_split(): " - "list->strdup_strings must be set"); for (;;) { - count++; - if (maxsplit >= 0 && count > maxsplit) { - string_list_append(list, p); - return count; - } - end = strpbrk(p, delim); - if (end) { - string_list_append_nodup(list, xmemdupz(p, end - p)); - p = end + 1; - } else { - string_list_append(list, p); + char *end; + + if (0 <= maxsplit && maxsplit <= count) + end = NULL; + else + end = strpbrk(p, delim); + + count += append_one(list, p, end, in_place); + + if (!end) return count; - } + p = end + 1; } } +int string_list_split(struct string_list *list, const char *string, + const char *delim, int maxsplit) +{ + return split_string(list, string, delim, maxsplit, 0); +} + int string_list_split_in_place(struct string_list *list, char *string, const char *delim, int maxsplit) { - int count = 0; - char *p = string, *end; - - if (list->strdup_strings) - BUG("internal error in string_list_split_in_place(): " - "list->strdup_strings must not be set"); - for (;;) { - count++; - if (maxsplit >= 0 && count > maxsplit) { - string_list_append(list, p); - return count; - } - end = strpbrk(p, delim); - if (end) { - *end = '\0'; - string_list_append(list, p); - p = end + 1; - } else { - string_list_append(list, p); - return count; - } - } + return split_string(list, string, delim, maxsplit, 1); } |