* libc/strptime.cc: Implement support for era, alt_digits and POSIX
padding and width modifiers. (era_info_t): New type. (free_era_info): New static function to free era_info_t storage. (get_era_info): New static function to create era_info_t storage from LC_TIME era information. (alt_digits_t): New type. (get_alt_digits): New static function to create alt_digits_t storage from LC_TIME alt_digits information. (free_alt_digits): New static function to free alt_digits_t storage. (find_alt_digits): New static function to scan input for alternative digits and return them, if any. Return NULL otherwise. (__strptime): New static function taking all code from strptime. Implement handling for E, O, +, 0, and width modifiers per POSIX-1.2008. (strptime): Convert into wrapper function to provide era_info and alt_digits pointers and call __strptime. (conv_num): Take additional alt_digits_t parameter and if it's not NULL, call find_alt_digits to convert.
This commit is contained in:
Corinna Vinschen
parent
f467ede283
commit
75bd77d246
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@ -1,3 +1,24 @@
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2010-02-26 Corinna Vinschen <corinna@vinschen.de>
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* libc/strptime.cc: Implement support for era, alt_digits and POSIX
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padding and width modifiers.
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(era_info_t): New type.
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(free_era_info): New static function to free era_info_t storage.
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(get_era_info): New static function to create era_info_t storage
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from LC_TIME era information.
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(alt_digits_t): New type.
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(get_alt_digits): New static function to create alt_digits_t storage
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from LC_TIME alt_digits information.
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(free_alt_digits): New static function to free alt_digits_t storage.
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(find_alt_digits): New static function to scan input for alternative
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digits and return them, if any. Return NULL otherwise.
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(__strptime): New static function taking all code from strptime.
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Implement handling for E, O, +, 0, and width modifiers per POSIX-1.2008.
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(strptime): Convert into wrapper function to provide era_info and
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alt_digits pointers and call __strptime.
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(conv_num): Take additional alt_digits_t parameter and if it's not
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NULL, call find_alt_digits to convert.
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2010-02-26 Corinna Vinschen <corinna@vinschen.de>
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* strsig.cc: Fix formatting and copyright.
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@ -41,6 +41,7 @@ __RCSID("$NetBSD: strptime.c,v 1.28 2008/04/28 20:23:01 martin Exp $");
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#include <sys/localedef.h>
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#endif
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#include <ctype.h>
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#include <stdlib.h>
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#include <locale.h>
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#include <string.h>
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#include <time.h>
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@ -63,24 +64,240 @@ __weak_alias(strptime,_strptime)
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static const char gmt[4] = { "GMT" };
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static const u_char *conv_num(const unsigned char *, int *, uint, uint);
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typedef struct _era_info_t {
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size_t num; /* Only in first entry: Number of entries,
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1 otherwise. */
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int dir; /* Direction */
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long offset; /* Number of year closest to start_date in the era. */
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struct tm start; /* Start date of era */
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struct tm end; /* End date of era */
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CHAR *era_C; /* Era string */
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CHAR *era_Y; /* Replacement for %EY */
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} era_info_t;
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static void
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free_era_info (era_info_t *era_info)
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{
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size_t num = era_info->num;
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for (size_t i = 0; i < num; ++i)
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{
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free (era_info[i].era_C);
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free (era_info[i].era_Y);
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}
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free (era_info);
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}
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static era_info_t *
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get_era_info (const char *era)
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{
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char *c;
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era_info_t *ei = NULL;
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size_t num = 0, cur = 0, len;
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while (*era)
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{
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++num;
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era_info_t *tmp = (era_info_t *) realloc (ei, num * sizeof (era_info_t));
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if (!tmp)
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{
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ei->num = cur;
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free_era_info (ei);
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return NULL;
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}
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ei = tmp;
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ei[cur].num = 1;
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ei[cur].dir = (*era == '+') ? 1 : -1;
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era += 2;
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ei[cur].offset = strtol (era, &c, 10);
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era = c + 1;
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ei[cur].start.tm_year = strtol (era, &c, 10);
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/* Adjust offset for negative gregorian dates. */
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if (ei[cur].start.tm_year < 0)
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++ei[cur].start.tm_year;
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ei[cur].start.tm_mon = strtol (c + 1, &c, 10);
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ei[cur].start.tm_mday = strtol (c + 1, &c, 10);
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ei[cur].start.tm_hour = ei[cur].start.tm_min = ei[cur].start.tm_sec = 0;
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era = c + 1;
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if (era[0] == '-' && era[1] == '*')
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{
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ei[cur].end = ei[cur].start;
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ei[cur].start.tm_year = INT_MIN;
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ei[cur].start.tm_mon = ei[cur].start.tm_mday = ei[cur].start.tm_hour
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= ei[cur].start.tm_min = ei[cur].start.tm_sec = 0;
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era += 3;
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}
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else if (era[0] == '+' && era[1] == '*')
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{
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ei[cur].end.tm_year = INT_MAX;
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ei[cur].end.tm_mon = 12;
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ei[cur].end.tm_mday = 31;
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ei[cur].end.tm_hour = 23;
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ei[cur].end.tm_min = ei[cur].end.tm_sec = 59;
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era += 3;
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}
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else
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{
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ei[cur].end.tm_year = strtol (era, &c, 10);
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/* Adjust offset for negative gregorian dates. */
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if (ei[cur].end.tm_year < 0)
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++ei[cur].end.tm_year;
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ei[cur].end.tm_mon = strtol (c + 1, &c, 10);
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ei[cur].end.tm_mday = strtol (c + 1, &c, 10);
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ei[cur].end.tm_mday = 31;
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ei[cur].end.tm_hour = 23;
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ei[cur].end.tm_min = ei[cur].end.tm_sec = 59;
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era = c + 1;
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}
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/* era_C */
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c = strchr (era, ':');
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len = c - era;
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ei[cur].era_C = (CHAR *) malloc ((len + 1) * sizeof (CHAR));
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if (!ei[cur].era_C)
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{
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ei->num = cur;
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free_era_info (ei);
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return NULL;
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}
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strncpy (ei[cur].era_C, era, len);
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era += len;
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ei[cur].era_C[len] = '\0';
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/* era_Y */
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++era;
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c = strchr (era, ';');
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if (!c)
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c = strchr (era, '\0');
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len = c - era;
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ei[cur].era_Y = (CHAR *) malloc ((len + 1) * sizeof (CHAR));
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if (!ei[cur].era_Y)
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{
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free (ei[cur].era_C);
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ei->num = cur;
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free_era_info (ei);
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return NULL;
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}
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strncpy (ei[cur].era_Y, era, len);
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era += len;
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ei[cur].era_Y[len] = '\0';
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++cur;
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if (*c)
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era = c + 1;
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}
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ei->num = num;
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return ei;
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}
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typedef struct _alt_digits_t {
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size_t num;
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char **digit;
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char *buffer;
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} alt_digits_t;
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static alt_digits_t *
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get_alt_digits (const char *alt_digits)
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{
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alt_digits_t *adi;
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const char *a, *e;
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char *aa, *ae;
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size_t len;
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adi = (alt_digits_t *) calloc (1, sizeof (alt_digits_t));
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if (!adi)
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return NULL;
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/* Compute number of alt_digits. */
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adi->num = 1;
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for (a = alt_digits; (e = strchr (a, ';')) != NULL; a = e + 1)
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++adi->num;
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/* Allocate the `digit' array, which is an array of `num' pointers into
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`buffer'. */
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adi->digit = (CHAR **) calloc (adi->num, sizeof (CHAR **));
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if (!adi->digit)
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{
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free (adi);
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return NULL;
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}
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/* Compute memory required for `buffer'. */
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len = strlen (alt_digits);
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/* Allocate it. */
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adi->buffer = (CHAR *) malloc ((len + 1) * sizeof (CHAR));
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if (!adi->buffer)
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{
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free (adi->digit);
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free (adi);
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return NULL;
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}
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/* Store digits in it. */
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strcpy (adi->buffer, alt_digits);
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/* Store the pointers into `buffer' into the appropriate `digit' slot. */
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for (len = 0, aa = adi->buffer; (ae = strchr (aa, ';')) != NULL;
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++len, aa = ae + 1)
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{
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*ae = '\0';
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adi->digit[len] = aa;
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}
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adi->digit[len] = aa;
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return adi;
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}
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static void
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free_alt_digits (alt_digits_t *adi)
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{
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free (adi->digit);
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free (adi->buffer);
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free (adi);
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}
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static const unsigned char *
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find_alt_digits (const unsigned char *bp, alt_digits_t *adi, uint *pval)
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{
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/* This is rather error-prone, but the entire idea of alt_digits
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isn't thought out well. If you start to look for matches at the
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start, there's a high probability that you find short matches but
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the entire translation is wrong. So we scan the alt_digits array
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from the highest to the lowest digits instead, hoping that it's
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more likely to catch digits consisting of multiple characters. */
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for (int i = (int) adi->num - 1; i >= 0; --i)
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{
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size_t len = strlen (adi->digit[i]);
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if (!strncmp ((const char *) bp, adi->digit[i], len))
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{
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*pval = i;
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return bp + len;
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}
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}
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return NULL;
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}
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/* This simplifies the calls to conv_num enormously. */
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#define ALT_DIGITS ((alt_format & ALT_O) ? *alt_digits : NULL)
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static const u_char *conv_num(const unsigned char *, int *, uint, uint,
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alt_digits_t *);
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static const u_char *find_string(const u_char *, int *, const char * const *,
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const char * const *, int);
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char *
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strptime(const char *buf, const char *fmt, struct tm *tm)
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static char *
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__strptime(const char *buf, const char *fmt, struct tm *tm,
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era_info_t **era_info, alt_digits_t **alt_digits)
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{
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unsigned char c;
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const unsigned char *bp;
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int alt_format, i, split_year = 0;
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era_info_t *era = NULL;
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int era_offset, got_eoff = 0;
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int saw_padding;
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unsigned long width;
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const char *new_fmt;
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uint ulim;
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bp = (const u_char *)buf;
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struct lc_time_T *_CurrentTimeLocale = __get_current_time_locale ();
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while (bp != NULL && (c = *fmt++) != '\0') {
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/* Clear `alternate' modifier prior to new conversion. */
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saw_padding = 0;
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width = 0;
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alt_format = 0;
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i = 0;
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@ -110,18 +327,43 @@ literal:
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case 'E': /* "%E?" alternative conversion modifier. */
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LEGAL_ALT(0);
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alt_format |= ALT_E;
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if (!*era_info && *_CurrentTimeLocale->era)
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*era_info = get_era_info (_CurrentTimeLocale->era);
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goto again;
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case 'O': /* "%O?" alternative conversion modifier. */
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LEGAL_ALT(0);
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alt_format |= ALT_O;
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if (!*alt_digits && *_CurrentTimeLocale->alt_digits)
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*alt_digits =
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get_alt_digits (_CurrentTimeLocale->alt_digits);
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goto again;
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case '0':
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case '+':
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LEGAL_ALT(0);
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if (saw_padding)
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return NULL;
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saw_padding = 1;
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goto again;
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case '1': case '2': case '3': case '4': case '5':
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case '6': case '7': case '8': case '9':
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/* POSIX-1.2008 maximum field width. Per POSIX,
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the width is only defined for the 'C', 'F', and 'Y'
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conversion specifiers. */
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LEGAL_ALT(0);
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{
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char *end;
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width = strtoul (fmt - 1, &end, 10);
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fmt = (const char *) end;
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goto again;
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}
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/*
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* "Complex" conversion rules, implemented through recursion.
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*/
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case 'c': /* Date and time, using the locale's format. */
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new_fmt = _ctloc(c_fmt);
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new_fmt = (alt_format & ALT_E)
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? _ctloc (era_d_t_fmt) : _ctloc(c_fmt);
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LEGAL_ALT(ALT_E);
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goto recurse;
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case 'D': /* The date as "%m/%d/%y". */
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@ -130,9 +372,15 @@ literal:
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goto recurse;
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case 'F': /* The date as "%Y-%m-%d". */
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new_fmt = "%Y-%m-%d";
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LEGAL_ALT(0);
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goto recurse;
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{
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LEGAL_ALT(0);
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char *tmp = __strptime ((const char *) bp, "%Y-%m-%d",
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tm, era_info, alt_digits);
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if (tmp && (uint) (tmp - (char *) bp) > width)
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return NULL;
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bp = (const unsigned char *) tmp;
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continue;
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}
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case 'R': /* The time as "%H:%M". */
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new_fmt = "%H:%M";
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@ -150,15 +398,19 @@ literal:
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goto recurse;
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case 'X': /* The time, using the locale's format. */
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new_fmt =_ctloc(X_fmt);
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new_fmt = (alt_format & ALT_E)
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? _ctloc (era_t_fmt) : _ctloc(X_fmt);
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LEGAL_ALT(ALT_E);
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goto recurse;
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case 'x': /* The date, using the locale's format. */
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new_fmt =_ctloc(x_fmt);
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recurse:
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bp = (const u_char *)strptime((const char *)bp,
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new_fmt, tm);
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new_fmt = (alt_format & ALT_E)
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? _ctloc (era_d_fmt) : _ctloc(x_fmt);
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LEGAL_ALT(ALT_E);
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recurse:
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bp = (const u_char *)__strptime((const char *)bp,
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new_fmt, tm,
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era_info, alt_digits);
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continue;
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/*
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|
@ -180,58 +432,83 @@ literal:
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continue;
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case 'C': /* The century number. */
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LEGAL_ALT(ALT_E);
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if ((alt_format & ALT_E) && *era_info)
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{
|
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/* With E modifier, an era. We potentially
|
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don't know the era offset yet, so we have to
|
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store the value in a local variable.
|
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The final computation of tm_year is only done
|
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right before this function returns. */
|
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size_t num = (*era_info)->num;
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for (size_t i = 0; i < num; ++i)
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if (!strncmp ((const char *) bp,
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(*era_info)[i].era_C,
|
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strlen ((*era_info)[i].era_C)))
|
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{
|
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era = (*era_info) + i;
|
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bp += strlen (era->era_C);
|
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break;
|
||||
}
|
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if (!era)
|
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return NULL;
|
||||
continue;
|
||||
}
|
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i = 20;
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bp = conv_num(bp, &i, 0, 99);
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for (ulim = 99; width && width < 2; ++width)
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ulim /= 10;
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bp = conv_num(bp, &i, 0, ulim, NULL);
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|
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i = i * 100 - TM_YEAR_BASE;
|
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if (split_year)
|
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i += tm->tm_year % 100;
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split_year = 1;
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tm->tm_year = i;
|
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LEGAL_ALT(ALT_E);
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era = NULL;
|
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got_eoff = 0;
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continue;
|
||||
|
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case 'd': /* The day of month. */
|
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case 'e':
|
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bp = conv_num(bp, &tm->tm_mday, 1, 31);
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LEGAL_ALT(ALT_O);
|
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bp = conv_num(bp, &tm->tm_mday, 1, 31, ALT_DIGITS);
|
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continue;
|
||||
|
||||
case 'k': /* The hour (24-hour clock representation). */
|
||||
LEGAL_ALT(0);
|
||||
/* FALLTHROUGH */
|
||||
case 'H':
|
||||
bp = conv_num(bp, &tm->tm_hour, 0, 23);
|
||||
LEGAL_ALT(ALT_O);
|
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bp = conv_num(bp, &tm->tm_hour, 0, 23, ALT_DIGITS);
|
||||
continue;
|
||||
|
||||
case 'l': /* The hour (12-hour clock representation). */
|
||||
LEGAL_ALT(0);
|
||||
/* FALLTHROUGH */
|
||||
case 'I':
|
||||
bp = conv_num(bp, &tm->tm_hour, 1, 12);
|
||||
LEGAL_ALT(ALT_O);
|
||||
bp = conv_num(bp, &tm->tm_hour, 1, 12, ALT_DIGITS);
|
||||
if (tm->tm_hour == 12)
|
||||
tm->tm_hour = 0;
|
||||
LEGAL_ALT(ALT_O);
|
||||
continue;
|
||||
|
||||
case 'j': /* The day of year. */
|
||||
i = 1;
|
||||
bp = conv_num(bp, &i, 1, 366);
|
||||
bp = conv_num(bp, &i, 1, 366, NULL);
|
||||
tm->tm_yday = i - 1;
|
||||
LEGAL_ALT(0);
|
||||
continue;
|
||||
|
||||
case 'M': /* The minute. */
|
||||
bp = conv_num(bp, &tm->tm_min, 0, 59);
|
||||
LEGAL_ALT(ALT_O);
|
||||
bp = conv_num(bp, &tm->tm_min, 0, 59, ALT_DIGITS);
|
||||
continue;
|
||||
|
||||
case 'm': /* The month. */
|
||||
i = 1;
|
||||
bp = conv_num(bp, &i, 1, 12);
|
||||
tm->tm_mon = i - 1;
|
||||
LEGAL_ALT(ALT_O);
|
||||
i = 1;
|
||||
bp = conv_num(bp, &i, 1, 12, ALT_DIGITS);
|
||||
tm->tm_mon = i - 1;
|
||||
continue;
|
||||
|
||||
case 'p': /* The locale's equivalent of AM/PM. */
|
||||
|
|
@ -243,8 +520,8 @@ literal:
|
|||
continue;
|
||||
|
||||
case 'S': /* The seconds. */
|
||||
bp = conv_num(bp, &tm->tm_sec, 0, 61);
|
||||
LEGAL_ALT(ALT_O);
|
||||
bp = conv_num(bp, &tm->tm_sec, 0, 61, ALT_DIGITS);
|
||||
continue;
|
||||
|
||||
case 'U': /* The week of year, beginning on sunday. */
|
||||
|
|
@ -255,28 +532,67 @@ literal:
|
|||
* point to calculate a real value, so just check the
|
||||
* range for now.
|
||||
*/
|
||||
bp = conv_num(bp, &i, 0, 53);
|
||||
LEGAL_ALT(ALT_O);
|
||||
bp = conv_num(bp, &i, 0, 53, ALT_DIGITS);
|
||||
continue;
|
||||
|
||||
case 'w': /* The day of week, beginning on sunday. */
|
||||
bp = conv_num(bp, &tm->tm_wday, 0, 6);
|
||||
LEGAL_ALT(ALT_O);
|
||||
bp = conv_num(bp, &tm->tm_wday, 0, 6, ALT_DIGITS);
|
||||
continue;
|
||||
|
||||
case 'Y': /* The year. */
|
||||
i = TM_YEAR_BASE; /* just for data sanity... */
|
||||
bp = conv_num(bp, &i, 0, 9999);
|
||||
tm->tm_year = i - TM_YEAR_BASE;
|
||||
LEGAL_ALT(ALT_E);
|
||||
if ((alt_format & ALT_E) && *era_info)
|
||||
{
|
||||
bool gotit = false;
|
||||
size_t num = (*era_info)->num;
|
||||
(*era_info)->num = 1;
|
||||
for (size_t i = 0; i < num; ++i)
|
||||
{
|
||||
era_info_t *tmp_ei = (*era_info) + i;
|
||||
char *tmp = __strptime ((const char *) bp,
|
||||
tmp_ei->era_Y,
|
||||
tm, &tmp_ei,
|
||||
alt_digits);
|
||||
if (tmp)
|
||||
{
|
||||
bp = (const unsigned char *) tmp;
|
||||
gotit = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
(*era_info)->num = num;
|
||||
if (gotit)
|
||||
continue;
|
||||
return NULL;
|
||||
}
|
||||
i = TM_YEAR_BASE; /* just for data sanity... */
|
||||
for (ulim = 9999; width && width < 4; ++width)
|
||||
ulim /= 10;
|
||||
bp = conv_num(bp, &i, 0, ulim, NULL);
|
||||
tm->tm_year = i - TM_YEAR_BASE;
|
||||
era = NULL;
|
||||
got_eoff = 0;
|
||||
continue;
|
||||
|
||||
case 'y': /* The year within 100 years of the epoch. */
|
||||
/* LEGAL_ALT(ALT_E | ALT_O); */
|
||||
bp = conv_num(bp, &i, 0, 99);
|
||||
if ((alt_format & ALT_E) && *era_info)
|
||||
{
|
||||
/* With E modifier, the offset to the start date
|
||||
of the era specified with %EC. We potentially
|
||||
don't know the era yet, so we have to store the
|
||||
value in a local variable, just like era itself.
|
||||
The final computation of tm_year is only done
|
||||
right before this function returns. */
|
||||
bp = conv_num(bp, &era_offset, 0, UINT_MAX, NULL);
|
||||
got_eoff = 1;
|
||||
continue;
|
||||
}
|
||||
bp = conv_num(bp, &i, 0, 99, ALT_DIGITS);
|
||||
|
||||
if (split_year)
|
||||
/* preserve century */
|
||||
if (split_year) /* preserve century */
|
||||
i += (tm->tm_year / 100) * 100;
|
||||
else {
|
||||
split_year = 1;
|
||||
|
|
@ -286,6 +602,8 @@ literal:
|
|||
i = i + 1900 - TM_YEAR_BASE;
|
||||
}
|
||||
tm->tm_year = i;
|
||||
era = NULL;
|
||||
got_eoff = 0;
|
||||
continue;
|
||||
|
||||
case 'Z':
|
||||
|
|
@ -334,29 +652,66 @@ literal:
|
|||
}
|
||||
}
|
||||
|
||||
if (bp && (era || got_eoff))
|
||||
{
|
||||
/* Default to current era. */
|
||||
if (!era)
|
||||
era = *era_info;
|
||||
/* Default to first year of era if offset is missing */
|
||||
if (!got_eoff)
|
||||
era_offset = era->offset;
|
||||
tm->tm_year = (era->start.tm_year != INT_MIN
|
||||
? era->start.tm_year : era->end.tm_year)
|
||||
+ (era_offset - era->offset) * era->dir;
|
||||
/* Check if year falls into the era. If not, it's an
|
||||
invalid combination of era and offset. */
|
||||
if (era->start.tm_year > tm->tm_year
|
||||
|| era->end.tm_year < tm->tm_year)
|
||||
return NULL;
|
||||
tm->tm_year -= TM_YEAR_BASE;
|
||||
}
|
||||
|
||||
return (char *) bp;
|
||||
}
|
||||
|
||||
char *
|
||||
strptime (const char *buf, const char *fmt, struct tm *tm)
|
||||
{
|
||||
era_info_t *era_info = NULL;
|
||||
alt_digits_t *alt_digits = NULL;
|
||||
char *ret = __strptime (buf, fmt, tm, &era_info, &alt_digits);
|
||||
if (era_info)
|
||||
free_era_info (era_info);
|
||||
if (alt_digits)
|
||||
free_alt_digits (alt_digits);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const u_char *
|
||||
conv_num(const unsigned char *buf, int *dest, uint llim, uint ulim)
|
||||
conv_num(const unsigned char *buf, int *dest, uint llim, uint ulim,
|
||||
alt_digits_t *alt_digits)
|
||||
{
|
||||
uint result = 0;
|
||||
unsigned char ch;
|
||||
|
||||
/* The limit also determines the number of valid digits. */
|
||||
uint rulim = ulim;
|
||||
if (alt_digits)
|
||||
buf = find_alt_digits (buf, alt_digits, &result);
|
||||
else
|
||||
{
|
||||
/* The limit also determines the number of valid digits. */
|
||||
uint rulim = ulim;
|
||||
|
||||
ch = *buf;
|
||||
if (ch < '0' || ch > '9')
|
||||
return NULL;
|
||||
ch = *buf;
|
||||
if (ch < '0' || ch > '9')
|
||||
return NULL;
|
||||
|
||||
do {
|
||||
result *= 10;
|
||||
result += ch - '0';
|
||||
rulim /= 10;
|
||||
ch = *++buf;
|
||||
} while ((result * 10 <= ulim) && rulim && ch >= '0' && ch <= '9');
|
||||
do {
|
||||
result *= 10;
|
||||
result += ch - '0';
|
||||
rulim /= 10;
|
||||
ch = *++buf;
|
||||
} while ((result * 10 <= ulim) && rulim && ch >= '0' && ch <= '9');
|
||||
}
|
||||
|
||||
if (result < llim || result > ulim)
|
||||
return NULL;
|
||||
|
|
|
|||
Loading…
Reference in New Issue