Avoid segfault with 'git branch' when the HEAD is detached

[git.git] / config.c

diff --git a/config.c b/config.c
index 82807c83b20ef8fbabfda7d476feff92f2dbb823..790405a213b12a4d1c62d9354e1292e0dc6af057 100644 (file)
--- a/config.c
+++ b/config.c
@@ -205,8 +205,27 @@ static int git_parse_file(config_fn_t fn, void *data)
        int baselen = 0;
        static char var[MAXNAME];
 
+       /* U+FEFF Byte Order Mark in UTF8 */
+       static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
+       const unsigned char *bomptr = utf8_bom;
+
        for (;;) {
                int c = get_next_char();
+               if (bomptr && *bomptr) {
+                       /* We are at the file beginning; skip UTF8-encoded BOM
+                        * if present. Sane editors won't put this in on their
+                        * own, but e.g. Windows Notepad will do it happily. */
+                       if ((unsigned char) c == *bomptr) {
+                               bomptr++;
+                               continue;
+                       } else {
+                               /* Do not tolerate partial BOM. */
+                               if (bomptr != utf8_bom)
+                                       break;
+                               /* No BOM at file beginning. Cool. */
+                               bomptr = NULL;
+                       }
+               }
                if (c == '\n') {
                        if (config_file_eof)
                                return 0;
@@ -255,7 +274,7 @@ static int parse_unit_factor(const char *end, unsigned long *val)
        return 0;
 }
 
-int git_parse_long(const char *value, long *ret)
+static int git_parse_long(const char *value, long *ret)
 {
        if (value && *value) {
                char *end;
@@ -291,7 +310,7 @@ static void die_bad_config(const char *name)
 
 int git_config_int(const char *name, const char *value)
 {
-       long ret;
+       long ret = 0;
        if (!git_parse_long(value, &ret))
                die_bad_config(name);
        return ret;
@@ -471,6 +490,11 @@ static int git_default_core_config(const char *var, const char *value)
                return 0;
        }
 
+       if (!strcmp(var, "core.preloadindex")) {
+               core_preload_index = git_config_bool(var, value);
+               return 0;
+       }
+
        /* Add other config variables here and to Documentation/config.txt. */
        return 0;
 }
@@ -612,10 +636,7 @@ int git_config(config_fn_t fn, void *data)
        char *repo_config = NULL;
        const char *home = NULL;
 
-       /* $GIT_CONFIG makes git read _only_ the given config file,
-        * $GIT_CONFIG_LOCAL will make it process it in addition to the
-        * global config file, the same way it would the per-repository
-        * config file otherwise. */
+       /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
        if (config_exclusive_filename)
                return git_config_from_file(fn, config_exclusive_filename, data);
        if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
@@ -734,9 +755,8 @@ static int store_write_section(int fd, const char* key)
 {
        const char *dot;
        int i, success;
-       struct strbuf sb;
+       struct strbuf sb = STRBUF_INIT;
 
-       strbuf_init(&sb, 0);
        dot = memchr(key, '.', store.baselen);
        if (dot) {
                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
@@ -761,7 +781,7 @@ static int store_write_pair(int fd, const char* key, const char* value)
        int i, success;
        int length = strlen(key + store.baselen + 1);
        const char *quote = "";
-       struct strbuf sb;
+       struct strbuf sb = STRBUF_INIT;
 
        /*
         * Check to see if the value needs to be surrounded with a dq pair.
@@ -778,7 +798,6 @@ static int store_write_pair(int fd, const char* key, const char* value)
        if (i && value[i - 1] == ' ')
                quote = "\"";
 
-       strbuf_init(&sb, 0);
        strbuf_addf(&sb, "\t%.*s = %s",
                    length, key + store.baselen + 1, quote);