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Code Issues Releases Wiki Activity

- asctime_r() now returns NULL if the buffer is too short to hold even a single

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byte of data.


git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15146 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Olaf Barthel
2006-09-25 13:43:06 +00:00
parent 2c450a1e48
commit 74b2838663
3 changed files with 88 additions and 92 deletions
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165
library/time_asctime_r.c
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@@ -1,5 +1,5 @@
/*
* $Id: time_asctime_r.c,v 1.9 2006-09-22 09:02:51 obarthel Exp $
* $Id: time_asctime_r.c,v 1.10 2006-09-25 13:43:06 obarthel Exp $
*
* :ts=4
*
@@ -74,6 +74,10 @@ char *
__asctime_r(const struct tm *tm,char * buffer,size_t buffer_size)
{
char * result = NULL;
size_t offset = 0;
struct tm copy_tm;
char number[16];
const char * b;
ENTER();
@@ -91,94 +95,85 @@ __asctime_r(const struct tm *tm,char * buffer,size_t buffer_size)
}
#endif /* CHECK_FOR_NULL_POINTERS */
if(buffer_size > 0)
if(buffer_size == 0)
goto out;
buffer_size--;
/* Fill in the week day if it's not in proper range. */
if(tm->tm_wday < 0 || tm->tm_wday > 6)
{
struct tm copy_tm;
char number[16];
const char * b;
size_t offset = 0;
/* We use a peculiar algorithm rather than falling back onto
mktime() here in order to avoid trouble with skewed results
owing to time zone influence. */
copy_tm = (*tm);
copy_tm.tm_wday = __calculate_weekday(tm->tm_year+1900,tm->tm_mon+1,tm->tm_mday);
buffer_size--;
/* Fill in the week day if it's not in proper range. */
if(tm->tm_wday < 0 || tm->tm_wday > 6)
{
/* We use a peculiar algorithm rather than falling back onto
mktime() here in order to avoid trouble with skewed results
owing to time zone influence. */
copy_tm = (*tm);
copy_tm.tm_wday = __calculate_weekday(tm->tm_year+1900,tm->tm_mon+1,tm->tm_mday);
tm = &copy_tm;
}
assert( 0 <= tm->tm_wday && tm->tm_wday <= 6 );
b = __abbreviated_week_day_names[tm->tm_wday];
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_mon && tm->tm_mon <= 11)
b = __abbreviated_month_names[tm->tm_mon];
else
b = "---";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(1 <= tm->tm_mday && tm->tm_mday <= 31)
b = __number_to_string((unsigned int)tm->tm_mday,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_hour && tm->tm_hour <= 23)
b = __number_to_string((unsigned int)tm->tm_hour,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size,":", &offset);
if(0 <= tm->tm_min && tm->tm_min <= 59)
b = __number_to_string((unsigned int)tm->tm_min,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size,":", &offset);
if(0 <= tm->tm_sec && tm->tm_sec <= 59)
b = __number_to_string((unsigned int)tm->tm_sec,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_year)
b = __number_to_string((unsigned int)1900 + tm->tm_year,number,sizeof(number),0);
else
b = "----";
add_to_string(buffer,buffer_size,b,&offset);
SHOWSTRING(buffer);
add_to_string(buffer,buffer_size,"\n",&offset);
assert( offset <= buffer_size );
buffer[offset] = '\0';
result = buffer;
tm = &copy_tm;
}
assert( 0 <= tm->tm_wday && tm->tm_wday <= 6 );
b = __abbreviated_week_day_names[tm->tm_wday];
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_mon && tm->tm_mon <= 11)
b = __abbreviated_month_names[tm->tm_mon];
else
{
result = (char *)"";
}
b = "---";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(1 <= tm->tm_mday && tm->tm_mday <= 31)
b = __number_to_string((unsigned int)tm->tm_mday,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_hour && tm->tm_hour <= 23)
b = __number_to_string((unsigned int)tm->tm_hour,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size,":", &offset);
if(0 <= tm->tm_min && tm->tm_min <= 59)
b = __number_to_string((unsigned int)tm->tm_min,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size,":", &offset);
if(0 <= tm->tm_sec && tm->tm_sec <= 59)
b = __number_to_string((unsigned int)tm->tm_sec,number,sizeof(number),2);
else
b = "--";
add_to_string(buffer,buffer_size,b, &offset);
add_to_string(buffer,buffer_size," ", &offset);
if(0 <= tm->tm_year)
b = __number_to_string((unsigned int)1900 + tm->tm_year,number,sizeof(number),0);
else
b = "----";
add_to_string(buffer,buffer_size,b,&offset);
SHOWSTRING(buffer);
add_to_string(buffer,buffer_size,"\n",&offset);
assert( offset <= buffer_size );
buffer[offset] = '\0';
result = buffer;
out: