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ruby/ext/date/date_strftime.c

634 строки
14 KiB
C
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/*
date_strftime.c: based on a public-domain implementation of ANSI C
library routine strftime, which is originally written by Arnold
Robbins.
*/
#include "ruby/ruby.h"
#include "date_tmx.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#if defined(HAVE_SYS_TIME_H)
#include <sys/time.h>
#endif
#undef strchr /* avoid AIX weirdness */
#define range(low, item, hi) (item)
#define add(x,y) (rb_funcall((x), '+', 1, (y)))
#define sub(x,y) (rb_funcall((x), '-', 1, (y)))
#define mul(x,y) (rb_funcall((x), '*', 1, (y)))
#define quo(x,y) (rb_funcall((x), rb_intern("quo"), 1, (y)))
#define div(x,y) (rb_funcall((x), rb_intern("div"), 1, (y)))
#define mod(x,y) (rb_funcall((x), '%', 1, (y)))
static void
upcase(char *s, size_t i)
{
do {
if (ISLOWER(*s))
*s = TOUPPER(*s);
} while (s++, --i);
}
static void
downcase(char *s, size_t i)
{
do {
if (ISUPPER(*s))
*s = TOLOWER(*s);
} while (s++, --i);
}
/* strftime --- produce formatted time */
static size_t
date_strftime_with_tmx(char *s, size_t maxsize, const char *format,
const struct tmx *tmx)
{
char *endp = s + maxsize;
char *start = s;
const char *sp, *tp;
auto char tbuf[100];
ptrdiff_t i;
int v, w;
size_t colons;
int precision, flags;
char padding;
/* LOCALE_[OE] and COLONS are actually modifiers, not flags */
enum {LEFT, CHCASE, LOWER, UPPER, LOCALE_O, LOCALE_E, COLONS};
#define BIT_OF(n) (1U<<(n))
/* various tables for locale C */
static const char days_l[][10] = {
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday",
};
static const char months_l[][10] = {
"January", "February", "March", "April",
"May", "June", "July", "August", "September",
"October", "November", "December",
};
static const char ampm[][3] = { "AM", "PM", };
if (s == NULL || format == NULL || tmx == NULL || maxsize == 0)
return 0;
/* quick check if we even need to bother */
if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) {
err:
errno = ERANGE;
return 0;
}
for (; *format && s < endp - 1; format++) {
#define FLAG_FOUND() do { \
if (precision > 0 || flags & (BIT_OF(LOCALE_E) | BIT_OF(LOCALE_O) | BIT_OF(COLONS))) \
goto unknown; \
} while (0)
#define NEEDS(n) do if (s >= endp || (n) >= endp - s - 1) goto err; while (0)
#define FILL_PADDING(i) do { \
if (!(flags & BIT_OF(LEFT)) && precision > (i)) { \
NEEDS(precision); \
memset(s, padding ? padding : ' ', precision - (i)); \
s += precision - (i); \
} \
else { \
NEEDS(i); \
} \
} while (0);
#define FMT(def_pad, def_prec, fmt, val) \
do { \
int l; \
if (precision <= 0) precision = (def_prec); \
if (flags & BIT_OF(LEFT)) precision = 1; \
l = snprintf(s, endp - s, \
((padding == '0' || (!padding && (def_pad) == '0')) ? \
"%0*"fmt : "%*"fmt), \
precision, (val)); \
if (l < 0) goto err; \
s += l; \
} while (0)
#define STRFTIME(fmt) \
do { \
i = date_strftime_with_tmx(s, endp - s, (fmt), tmx); \
if (!i) return 0; \
if (flags & BIT_OF(UPPER)) \
upcase(s, i); \
if (!(flags & BIT_OF(LEFT)) && precision > i) { \
if (start + maxsize < s + precision) { \
errno = ERANGE; \
return 0; \
} \
memmove(s + precision - i, s, i); \
memset(s, padding ? padding : ' ', precision - i); \
s += precision; \
} \
else s += i; \
} while (0)
#define FMTV(def_pad, def_prec, fmt, val) \
do { \
VALUE tmp = (val); \
if (FIXNUM_P(tmp)) { \
FMT((def_pad), (def_prec), "l"fmt, FIX2LONG(tmp)); \
} \
else { \
VALUE args[2], result; \
size_t l; \
if (precision <= 0) precision = (def_prec); \
if (flags & BIT_OF(LEFT)) precision = 1; \
args[0] = INT2FIX(precision); \
args[1] = (val); \
if (padding == '0' || (!padding && (def_pad) == '0')) \
result = rb_str_format(2, args, rb_str_new2("%0*"fmt)); \
else \
result = rb_str_format(2, args, rb_str_new2("%*"fmt)); \
l = strlcpy(s, StringValueCStr(result), endp - s); \
if ((size_t)(endp - s) <= l) \
goto err; \
s += l; \
} \
} while (0)
if (*format != '%') {
*s++ = *format;
continue;
}
tp = tbuf;
sp = format;
precision = -1;
flags = 0;
padding = 0;
colons = 0;
again:
switch (*++format) {
case '\0':
format--;
goto unknown;
case 'A': /* full weekday name */
case 'a': /* abbreviated weekday name */
if (flags & BIT_OF(CHCASE)) {
flags &= ~(BIT_OF(LOWER) | BIT_OF(CHCASE));
flags |= BIT_OF(UPPER);
}
{
int wday = tmx_wday;
if (wday < 0 || wday > 6)
i = 1, tp = "?";
else {
if (*format == 'A')
i = strlen(tp = days_l[wday]);
else
i = 3, tp = days_l[wday];
}
}
break;
case 'B': /* full month name */
case 'b': /* abbreviated month name */
case 'h': /* same as %b */
if (flags & BIT_OF(CHCASE)) {
flags &= ~(BIT_OF(LOWER) | BIT_OF(CHCASE));
flags |= BIT_OF(UPPER);
}
{
int mon = tmx_mon;
if (mon < 1 || mon > 12)
i = 1, tp = "?";
else {
if (*format == 'B')
i = strlen(tp = months_l[mon - 1]);
else
i = 3, tp = months_l[mon - 1];
}
}
break;
case 'C': /* century (year/100) */
FMTV('0', 2, "d", div(tmx_year, INT2FIX(100)));
continue;
case 'c': /* appropriate date and time representation */
STRFTIME("%a %b %e %H:%M:%S %Y");
continue;
case 'D':
STRFTIME("%m/%d/%y");
continue;
case 'd': /* day of the month, 01 - 31 */
case 'e': /* day of month, blank padded */
v = range(1, tmx_mday, 31);
FMT((*format == 'd') ? '0' : ' ', 2, "d", v);
continue;
case 'F':
STRFTIME("%Y-%m-%d");
continue;
case 'G': /* year of ISO week with century */
case 'Y': /* year with century */
{
VALUE year = (*format == 'G') ? tmx_cwyear : tmx_year;
if (FIXNUM_P(year)) {
long y = FIX2LONG(year);
FMT('0', 0 <= y ? 4 : 5, "ld", y);
}
else {
FMTV('0', 4, "d", year);
}
}
continue;
case 'g': /* year of ISO week without a century */
case 'y': /* year without a century */
v = NUM2INT(mod((*format == 'g') ? tmx_cwyear : tmx_year, INT2FIX(100)));
FMT('0', 2, "d", v);
continue;
case 'H': /* hour, 24-hour clock, 00 - 23 */
case 'k': /* hour, 24-hour clock, blank pad */
v = range(0, tmx_hour, 23);
FMT((*format == 'H') ? '0' : ' ', 2, "d", v);
continue;
case 'I': /* hour, 12-hour clock, 01 - 12 */
case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */
v = range(0, tmx_hour, 23);
if (v == 0)
v = 12;
else if (v > 12)
v -= 12;
FMT((*format == 'I') ? '0' : ' ', 2, "d", v);
continue;
case 'j': /* day of the year, 001 - 366 */
v = range(1, tmx_yday, 366);
FMT('0', 3, "d", v);
continue;
case 'L': /* millisecond */
case 'N': /* nanosecond */
if (*format == 'L')
w = 3;
else
w = 9;
if (precision <= 0)
precision = w;
NEEDS(precision);
{
VALUE subsec = tmx_sec_fraction;
int ww;
long n;
ww = precision;
while (9 <= ww) {
subsec = mul(subsec, INT2FIX(1000000000));
ww -= 9;
}
n = 1;
for (; 0 < ww; ww--)
n *= 10;
if (n != 1)
subsec = mul(subsec, INT2FIX(n));
subsec = div(subsec, INT2FIX(1));
if (FIXNUM_P(subsec)) {
(void)snprintf(s, endp - s, "%0*ld",
precision, FIX2LONG(subsec));
s += precision;
}
else {
VALUE args[2], result;
args[0] = INT2FIX(precision);
args[1] = subsec;
result = rb_str_format(2, args, rb_str_new2("%0*d"));
(void)strlcpy(s, StringValueCStr(result), endp - s);
s += precision;
}
}
continue;
case 'M': /* minute, 00 - 59 */
v = range(0, tmx_min, 59);
FMT('0', 2, "d", v);
continue;
case 'm': /* month, 01 - 12 */
v = range(1, tmx_mon, 12);
FMT('0', 2, "d", v);
continue;
case 'n': /* same as \n */
FILL_PADDING(1);
*s++ = '\n';
continue;
case 't': /* same as \t */
FILL_PADDING(1);
*s++ = '\t';
continue;
case 'P': /* am or pm based on 12-hour clock */
case 'p': /* AM or PM based on 12-hour clock */
if ((*format == 'p' && (flags & BIT_OF(CHCASE))) ||
(*format == 'P' && !(flags & (BIT_OF(CHCASE) | BIT_OF(UPPER))))) {
flags &= ~(BIT_OF(UPPER) | BIT_OF(CHCASE));
flags |= BIT_OF(LOWER);
}
v = range(0, tmx_hour, 23);
if (v < 12)
tp = ampm[0];
else
tp = ampm[1];
i = 2;
break;
case 'Q': /* milliseconds since Unix epoch */
FMTV('0', 1, "d", tmx_msecs);
continue;
case 'R':
STRFTIME("%H:%M");
continue;
case 'r':
STRFTIME("%I:%M:%S %p");
continue;
case 'S': /* second, 00 - 59 */
v = range(0, tmx_sec, 59);
FMT('0', 2, "d", v);
continue;
case 's': /* seconds since Unix epoch */
FMTV('0', 1, "d", tmx_secs);
continue;
case 'T':
STRFTIME("%H:%M:%S");
continue;
case 'U': /* week of year, Sunday is first day of week */
case 'W': /* week of year, Monday is first day of week */
v = range(0, (*format == 'U') ? tmx_wnum0 : tmx_wnum1, 53);
FMT('0', 2, "d", v);
continue;
case 'u': /* weekday, Monday == 1, 1 - 7 */
v = range(1, tmx_cwday, 7);
FMT('0', 1, "d", v);
continue;
case 'V': /* week of year according ISO 8601 */
v = range(1, tmx_cweek, 53);
FMT('0', 2, "d", v);
continue;
case 'v':
STRFTIME("%e-%b-%Y");
continue;
case 'w': /* weekday, Sunday == 0, 0 - 6 */
v = range(0, tmx_wday, 6);
FMT('0', 1, "d", v);
continue;
case 'X': /* appropriate time representation */
STRFTIME("%H:%M:%S");
continue;
case 'x': /* appropriate date representation */
STRFTIME("%m/%d/%y");
continue;
case 'Z': /* time zone name or abbreviation */
if (flags & BIT_OF(CHCASE)) {
flags &= ~(BIT_OF(UPPER) | BIT_OF(CHCASE));
flags |= BIT_OF(LOWER);
}
{
char *zone = tmx_zone;
if (zone == NULL)
tp = "";
else
tp = zone;
i = strlen(tp);
}
break;
case 'z': /* offset from UTC */
{
long off, aoff;
int hl, hw;
off = tmx_offset;
aoff = off;
if (aoff < 0)
aoff = -off;
if ((aoff / 3600) < 10)
hl = 1;
else
hl = 2;
hw = 2;
if (flags & BIT_OF(LEFT) && hl == 1)
hw = 1;
switch (colons) {
case 0: /* %z -> +hhmm */
precision = precision <= (3 + hw) ? hw : precision - 3;
NEEDS(precision + 3);
break;
case 1: /* %:z -> +hh:mm */
precision = precision <= (4 + hw) ? hw : precision - 4;
NEEDS(precision + 4);
break;
case 2: /* %::z -> +hh:mm:ss */
precision = precision <= (7 + hw) ? hw : precision - 7;
NEEDS(precision + 7);
break;
case 3: /* %:::z -> +hh[:mm[:ss]] */
{
if (aoff % 3600 == 0) {
precision = precision <= (1 + hw) ?
hw : precision - 1;
NEEDS(precision + 3);
}
else if (aoff % 60 == 0) {
precision = precision <= (4 + hw) ?
hw : precision - 4;
NEEDS(precision + 4);
}
else {
precision = precision <= (7 + hw) ?
hw : precision - 7;
NEEDS(precision + 7);
}
}
break;
default:
format--;
goto unknown;
}
if (padding == ' ' && precision > hl) {
i = snprintf(s, endp - s, "%*s", precision - hl, "");
precision = hl;
if (i < 0) goto err;
s += i;
}
if (off < 0) {
off = -off;
*s++ = '-';
} else {
*s++ = '+';
}
i = snprintf(s, endp - s, "%.*ld", precision, off / 3600);
if (i < 0) goto err;
s += i;
off = off % 3600;
if (colons == 3 && off == 0)
continue;
if (1 <= colons)
*s++ = ':';
i = snprintf(s, endp - s, "%02d", (int)(off / 60));
if (i < 0) goto err;
s += i;
off = off % 60;
if (colons == 3 && off == 0)
continue;
if (2 <= colons) {
*s++ = ':';
i = snprintf(s, endp - s, "%02d", (int)off);
if (i < 0) goto err;
s += i;
}
}
continue;
case '+':
STRFTIME("%a %b %e %H:%M:%S %Z %Y");
continue;
case 'E':
/* POSIX locale extensions, ignored for now */
flags |= BIT_OF(LOCALE_E);
if (*(format + 1) && strchr("cCxXyY", *(format + 1)))
goto again;
goto unknown;
case 'O':
/* POSIX locale extensions, ignored for now */
flags |= BIT_OF(LOCALE_O);
if (*(format + 1) && strchr("deHkIlmMSuUVwWy", *(format + 1)))
goto again;
goto unknown;
case ':':
flags |= BIT_OF(COLONS);
{
size_t l = strspn(format, ":");
format += l;
if (*format == 'z') {
colons = l;
format--;
goto again;
}
format -= l;
}
goto unknown;
case '_':
FLAG_FOUND();
padding = ' ';
goto again;
case '-':
FLAG_FOUND();
flags |= BIT_OF(LEFT);
goto again;
case '^':
FLAG_FOUND();
flags |= BIT_OF(UPPER);
goto again;
case '#':
FLAG_FOUND();
flags |= BIT_OF(CHCASE);
goto again;
case '0':
FLAG_FOUND();
padding = '0';
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
char *e;
precision = (int)strtoul(format, &e, 10);
format = e - 1;
goto again;
}
case '%':
FILL_PADDING(1);
*s++ = '%';
continue;
default:
unknown:
i = format - sp + 1;
tp = sp;
precision = -1;
flags = 0;
padding = 0;
colons = 0;
break;
}
if (i) {
FILL_PADDING(i);
memcpy(s, tp, i);
switch (flags & (BIT_OF(UPPER) | BIT_OF(LOWER))) {
case BIT_OF(UPPER):
upcase(s, i);
break;
case BIT_OF(LOWER):
downcase(s, i);
break;
}
s += i;
}
}
if (s >= endp) {
goto err;
}
if (*format == '\0') {
*s = '\0';
return (s - start);
}
return 0;
}
size_t
date_strftime(char *s, size_t maxsize, const char *format,
const struct tmx *tmx)
{
return date_strftime_with_tmx(s, maxsize, format, tmx);
}
/*
Local variables:
c-file-style: "ruby"
End:
*/
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