From 49d6cfa5c2874d78360dc4b16558bb45b5f8e003 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Mon, 26 Aug 2013 17:57:18 -0400 Subject: config: do not use C function names as struct members According to C99, section 7.1.4: Any function declared in a header may be additionally implemented as a function-like macro defined in the header. Therefore calling our struct member function pointer "fgetc" may run afoul of unwanted macro expansion when we call: char c = cf->fgetc(cf); This turned out to be a problem on uclibc, which defines fgetc as a macro and causes compilation failure. The standard suggests fixing this in a few ways: 1. Using extra parentheses to inhibit the function-like macro expansion. E.g., "(cf->fgetc)(cf)". This is undesirable as it's ugly, and each call site needs to remember to use it (and on systems without the macro, forgetting will compile just fine). 2. Using #undef (because a conforming implementation must also be providing fgetc as a function). This is undesirable because presumably the implementation was using the macro for a performance benefit, and we are dropping that optimization. Instead, we can simply use non-colliding names. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- config.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/config.c b/config.c index 680dd6d685..95f9a449d7 100644 --- a/config.c +++ b/config.c @@ -27,9 +27,9 @@ struct config_source { struct strbuf value; struct strbuf var; - int (*fgetc)(struct config_source *c); - int (*ungetc)(int c, struct config_source *conf); - long (*ftell)(struct config_source *c); + int (*do_fgetc)(struct config_source *c); + int (*do_ungetc)(int c, struct config_source *conf); + long (*do_ftell)(struct config_source *c); }; static struct config_source *cf; @@ -217,13 +217,13 @@ int git_config_from_parameters(config_fn_t fn, void *data) static int get_next_char(void) { - int c = cf->fgetc(cf); + int c = cf->do_fgetc(cf); if (c == '\r') { /* DOS like systems */ - c = cf->fgetc(cf); + c = cf->do_fgetc(cf); if (c != '\n') { - cf->ungetc(c, cf); + cf->do_ungetc(c, cf); c = '\r'; } } @@ -982,9 +982,9 @@ int git_config_from_file(config_fn_t fn, const char *filename, void *data) top.u.file = f; top.name = filename; top.die_on_error = 1; - top.fgetc = config_file_fgetc; - top.ungetc = config_file_ungetc; - top.ftell = config_file_ftell; + top.do_fgetc = config_file_fgetc; + top.do_ungetc = config_file_ungetc; + top.do_ftell = config_file_ftell; ret = do_config_from(&top, fn, data); @@ -1003,9 +1003,9 @@ int git_config_from_buf(config_fn_t fn, const char *name, const char *buf, top.u.buf.pos = 0; top.name = name; top.die_on_error = 0; - top.fgetc = config_buf_fgetc; - top.ungetc = config_buf_ungetc; - top.ftell = config_buf_ftell; + top.do_fgetc = config_buf_fgetc; + top.do_ungetc = config_buf_ungetc; + top.do_ftell = config_buf_ftell; return do_config_from(&top, fn, data); } @@ -1186,7 +1186,7 @@ static int store_aux(const char *key, const char *value, void *cb) return 1; } - store.offset[store.seen] = cf->ftell(cf); + store.offset[store.seen] = cf->do_ftell(cf); store.seen++; } break; @@ -1213,19 +1213,19 @@ static int store_aux(const char *key, const char *value, void *cb) * Do not increment matches: this is no match, but we * just made sure we are in the desired section. */ - store.offset[store.seen] = cf->ftell(cf); + store.offset[store.seen] = cf->do_ftell(cf); /* fallthru */ case SECTION_END_SEEN: case START: if (matches(key, value)) { - store.offset[store.seen] = cf->ftell(cf); + store.offset[store.seen] = cf->do_ftell(cf); store.state = KEY_SEEN; store.seen++; } else { if (strrchr(key, '.') - key == store.baselen && !strncmp(key, store.key, store.baselen)) { store.state = SECTION_SEEN; - store.offset[store.seen] = cf->ftell(cf); + store.offset[store.seen] = cf->do_ftell(cf); } } } -- cgit v1.2.3