config: teach "git -c" to recognize an empty string

diff --git a/config.c b/config.c
index 9f9bf0cc9a1405e938fddbedc44468782ad61021..5390a63acb372eaa18ba4e83022789155fcc1c1f 100644 (file)
--- a/config.c
+++ b/config.c
@@ -164,19 +164,27 @@ void git_config_push_parameter(const char *text)
 int git_config_parse_parameter(const char *text,
                               config_fn_t fn, void *data)
 {
+       const char *value;
        struct strbuf **pair;
+
        pair = strbuf_split_str(text, '=', 2);
        if (!pair[0])
                return error("bogus config parameter: %s", text);
-       if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
+
+       if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
                strbuf_setlen(pair[0], pair[0]->len - 1);
+               value = pair[1] ? pair[1]->buf : "";
+       } else {
+               value = NULL;
+       }
+
        strbuf_trim(pair[0]);
        if (!pair[0]->len) {
                strbuf_list_free(pair);
                return error("bogus config parameter: %s", text);
        }
        lowercase(pair[0]->buf);
-       if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
+       if (fn(pair[0]->buf, value, data) < 0) {
                strbuf_list_free(pair);
                return -1;
        }
@@ -468,7 +476,7 @@ static int parse_unit_factor(const char *end, uintmax_t *val)
        return 0;
 }
 
-static int git_parse_long(const char *value, long *ret)
+static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 {
        if (value && *value) {
                char *end;
@@ -480,21 +488,25 @@ static int git_parse_long(const char *value, long *ret)
                val = strtoimax(value, &end, 0);
                if (errno == ERANGE)
                        return 0;
-               if (!parse_unit_factor(end, &factor))
+               if (!parse_unit_factor(end, &factor)) {
+                       errno = EINVAL;
                        return 0;
+               }
                uval = abs(val);
                uval *= factor;
-               if ((uval > maximum_signed_value_of_type(long)) ||
-                   (abs(val) > uval))
+               if (uval > max || abs(val) > uval) {
+                       errno = ERANGE;
                        return 0;
+               }
                val *= factor;
                *ret = val;
                return 1;
        }
+       errno = EINVAL;
        return 0;
 }
 
-int git_parse_ulong(const char *value, unsigned long *ret)
+static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 {
        if (value && *value) {
                char *end;
@@ -506,29 +518,75 @@ int git_parse_ulong(const char *value, unsigned long *ret)
                if (errno == ERANGE)
                        return 0;
                oldval = val;
-               if (!parse_unit_factor(end, &val))
+               if (!parse_unit_factor(end, &val)) {
+                       errno = EINVAL;
                        return 0;
-               if ((val > maximum_unsigned_value_of_type(long)) ||
-                   (oldval > val))
+               }
+               if (val > max || oldval > val) {
+                       errno = ERANGE;
                        return 0;
+               }
                *ret = val;
                return 1;
        }
+       errno = EINVAL;
        return 0;
 }
 
-static void die_bad_config(const char *name)
+static int git_parse_int(const char *value, int *ret)
+{
+       intmax_t tmp;
+       if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
+               return 0;
+       *ret = tmp;
+       return 1;
+}
+
+static int git_parse_int64(const char *value, int64_t *ret)
+{
+       intmax_t tmp;
+       if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
+               return 0;
+       *ret = tmp;
+       return 1;
+}
+
+int git_parse_ulong(const char *value, unsigned long *ret)
+{
+       uintmax_t tmp;
+       if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
+               return 0;
+       *ret = tmp;
+       return 1;
+}
+
+static void die_bad_number(const char *name, const char *value)
 {
+       const char *reason = errno == ERANGE ?
+                            "out of range" :
+                            "invalid unit";
+       if (!value)
+               value = "";
+
        if (cf && cf->name)
-               die("bad config value for '%s' in %s", name, cf->name);
-       die("bad config value for '%s'", name);
+               die("bad numeric config value '%s' for '%s' in %s: %s",
+                   value, name, cf->name, reason);
+       die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 }
 
 int git_config_int(const char *name, const char *value)
 {
-       long ret = 0;
-       if (!git_parse_long(value, &ret))
-               die_bad_config(name);
+       int ret;
+       if (!git_parse_int(value, &ret))
+               die_bad_number(name, value);
+       return ret;
+}
+
+int64_t git_config_int64(const char *name, const char *value)
+{
+       int64_t ret;
+       if (!git_parse_int64(value, &ret))
+               die_bad_number(name, value);
        return ret;
 }
 
@@ -536,7 +594,7 @@ unsigned long git_config_ulong(const char *name, const char *value)
 {
        unsigned long ret;
        if (!git_parse_ulong(value, &ret))
-               die_bad_config(name);
+               die_bad_number(name, value);
        return ret;
 }
 
@@ -559,10 +617,10 @@ static int git_config_maybe_bool_text(const char *name, const char *value)
 
 int git_config_maybe_bool(const char *name, const char *value)
 {
-       long v = git_config_maybe_bool_text(name, value);
+       int v = git_config_maybe_bool_text(name, value);
        if (0 <= v)
                return v;
-       if (git_parse_long(value, &v))
+       if (git_parse_int(value, &v))
                return !!v;
        return -1;
 }