This makes config's lowercase() function public.

Note that we could continue to offer a pure-string
lowercase, but there would be no callers (in most
pure-string cases, we actually duplicate and lowercase the
duplicate).

Signed-off-by: Jeff King <p...@peff.net>
---
 Documentation/technical/api-strbuf.txt | 4 ++++
 config.c                               | 8 +-------
 strbuf.c                               | 7 +++++++
 strbuf.h                               | 1 +
 4 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/Documentation/technical/api-strbuf.txt 
b/Documentation/technical/api-strbuf.txt
index 3350d97..8480f89 100644
--- a/Documentation/technical/api-strbuf.txt
+++ b/Documentation/technical/api-strbuf.txt
@@ -125,6 +125,10 @@ Functions
 
        Strip whitespace from the end of a string.
 
+`strbuf_tolower`::
+
+       Lowercase each character in the buffer using `tolower`.
+
 `strbuf_cmp`::
 
        Compare two buffers. Returns an integer less than, equal to, or greater
diff --git a/config.c b/config.c
index a30cb5c..03ce5c6 100644
--- a/config.c
+++ b/config.c
@@ -147,12 +147,6 @@ int git_config_include(const char *var, const char *value, 
void *data)
        return ret;
 }
 
-static void lowercase(char *p)
-{
-       for (; *p; p++)
-               *p = tolower(*p);
-}
-
 void git_config_push_parameter(const char *text)
 {
        struct strbuf env = STRBUF_INIT;
@@ -180,7 +174,7 @@ int git_config_parse_parameter(const char *text,
                strbuf_list_free(pair);
                return error("bogus config parameter: %s", text);
        }
-       lowercase(pair[0]->buf);
+       strbuf_tolower(pair[0]);
        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
                strbuf_list_free(pair);
                return -1;
diff --git a/strbuf.c b/strbuf.c
index 854c725..3da4f3e 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -106,6 +106,13 @@ void strbuf_ltrim(struct strbuf *sb)
        sb->buf[sb->len] = '\0';
 }
 
+void strbuf_tolower(struct strbuf *sb)
+{
+       char *p;
+       for (p = sb->buf; *p; p++)
+               *p = tolower(*p);
+}
+
 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
                                 int terminator, int max)
 {
diff --git a/strbuf.h b/strbuf.h
index 4de7531..25328b9 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -45,6 +45,7 @@ static inline void strbuf_setlen(struct strbuf *sb, size_t 
len)
 extern void strbuf_trim(struct strbuf *);
 extern void strbuf_rtrim(struct strbuf *);
 extern void strbuf_ltrim(struct strbuf *);
+extern void strbuf_tolower(struct strbuf *sb);
 extern int strbuf_cmp(const struct strbuf *, const struct strbuf *);
 
 /*
-- 
2.0.0.rc1.436.g03cb729
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