Re: [evolution-patches] g_strftime

[Jeffrey Stedfast <fejj ximian com>]

as it turns out, that was wrong too s/buflen/max/

anyways, attached is a simpler method that doesn't build it
incrementally (which is probably better anyway).

Jeff

On Fri, 2003-05-23 at 18:22, Jeffrey Stedfast wrote:
> oops, forgot to save my emacs buffer before attaching. lets try this
> again.
> 
> Jeff
> 
> On Fri, 2003-05-23 at 18:13, Jeffrey Stedfast wrote:
> > an idea for implementing a workable strftime implementation that returns
> > a malloc'd buffer. also works around the fact that strftime is Broken By
> > Design (tm).
> > 
> > Jeff
-- 
Jeffrey Stedfast
Evolution Hacker - Ximian, Inc.
fejj ximian com  - www.ximian.com

char *
g_strftime (const char *format, const struct tm *tm)
{
	const char *start, *inptr;
	char *time_str, *buf;
	size_t max, n;
	GString *str;
	char fmt[4];
	
	fmt[0] = '%';
	fmt[2] = ' ';
	fmt[3] = '\0';
	
	max = 64;
	buf = g_malloc (max);
	
	str = g_string_new ("");
	
	inptr = format;
	while (*inptr) {
		start = inptr;
		
		while (*inptr && *inptr != '%')
			inptr++;
		
		g_string_append_len (str, start, inptr - start);
		
		if (*inptr == '\0')
			break;
		
		inptr++;
		if (*inptr == '%') {
			g_string_append_c (str, *inptr++);
		} else {
			fmt[1] = *inptr++;
			
		retry:
			if ((n = strftime (buf, max, fmt, tm)) != 0) {
				g_string_append_len (str, buf, n - 1);
			} else {
				max <<= 1;
				buf = g_realloc (buf, max);
				goto retry;
			}
		}
	}
	
	g_free (buf);
	
	time_str = str->str;
	g_string_free (str, FALSE);
	
	return time_str;
}


char *
g_strftime (const char *format, const struct tm *tm)
{
	char *fmt, *buf;
	size_t max, n;
	
	max = strlen (format);
	
	fmt = g_alloca (max + 2);
	buf = g_stpcpy (fmt, format);
	*buf++ = ' ';
	*buf = '\0';
	
	max = (max + 2) << 1;
	buf = g_malloc (max);
	
	str = g_string_new ("");
	
	while ((n = strftime (buf, max, fmt, tm)) == 0) {
		max <<= 1;
		buf = g_realloc (buf, max);
	}
	
	buf[n - 1] = '\0';
	
	return buf;
}