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simpler code to read a line from a file (using 'getc' or, if present,

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'getc_unlocked')
This commit is contained in:
Roberto Ierusalimschy 2014-03-06 14:12:02 -03:00
parent 5ff1c18a71
commit c5bb3643ab
1 changed files with 24 additions and 17 deletions
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41
liolib.c
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@ -1,5 +1,5 @@
/*
** $Id: liolib.c,v 2.116 2014/02/21 14:39:50 roberto Exp roberto $
** $Id: liolib.c,v 2.117 2014/02/26 15:27:56 roberto Exp roberto $
** Standard I/O (and system) library
** See Copyright Notice in lua.h
*/
@ -79,6 +79,21 @@
/* }====================================================== */
#if !defined(lua_getc) /* { */
#if defined(LUA_USE_POSIX)
#define lua_getc(f) getc_unlocked(f)
#define lua_lockfile(f) flockfile(f)
#define lua_unlockfile(f) funlockfile(f)
#else
#define lua_getc(f) getc(f)
#define lua_lockfile(f) ((void)0)
#define lua_unlockfile(f) ((void)0)
#endif
#endif /* } */
/*
** {======================================================
** lua_fseek: configuration for longer offsets
@ -384,23 +399,15 @@ static int test_eof (lua_State *L, FILE *f) {
static int read_line (lua_State *L, FILE *f, int chop) {
luaL_Buffer b;
int c;
luaL_buffinit(L, &b);
for (;;) {
size_t l;
char *p = luaL_prepbuffer(&b);
if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
luaL_pushresult(&b); /* close buffer */
return (lua_rawlen(L, -1) > 0); /* check whether read something */
}
l = strlen(p);
if (l == 0 || p[l-1] != '\n')
luaL_addsize(&b, l);
else {
luaL_addsize(&b, l - chop); /* chop 'eol' if needed */
luaL_pushresult(&b); /* close buffer */
return 1; /* read at least an `eol' */
}
}
lua_lockfile(f);
while ((c = lua_getc(f)) != EOF && c != '\n')
luaL_addchar(&b, c);
lua_unlockfile(f);
if (!chop && c == '\n') luaL_addchar(&b, c);
luaL_pushresult(&b); /* close buffer */
return (c == '\n' || lua_rawlen(L, -1) > 0);
}