385 lines
7.5 KiB
C
385 lines
7.5 KiB
C
#include <time.h>
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#include <string.h>
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#include <stdlib.h>
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#include "vary.h"
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struct trans {
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int val;
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char *str;
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};
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static struct trans trans_mon[] = {
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{ 1, "january" }, { 2, "february" }, { 3, "march" }, { 4, "april" },
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{ 6, "june" }, { 7, "july" }, { 8, "august" }, { 9, "september" },
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{ 10, "october" }, { 11, "november" }, { 12, "december" },
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{ -1, NULL }
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};
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static struct trans trans_wday[] = {
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{ 0, "sunday" }, { 1, "monday" }, { 2, "tuesday" }, { 3, "wednesday" },
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{ 4, "thursday" }, { 5, "friday" }, { 6, "saturday" },
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{ -1, NULL }
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};
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static char digits[] = "0123456789";
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static int
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trans(const struct trans t[], const char *arg)
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{
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int f;
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for (f = 0; t[f].val != -1; f++)
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if (!strncasecmp(t[f].str, arg, 3) ||
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!strncasecmp(t[f].str, arg, strlen(t[f].str)))
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return t[f].val;
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return -1;
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}
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struct vary *
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vary_append(struct vary *v, char *arg)
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{
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struct vary *result, **nextp;
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if (v) {
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result = v;
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while (v->next)
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v = v->next;
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nextp = &v->next;
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} else
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nextp = &result;
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*nextp = (struct vary *)malloc(sizeof(struct vary));
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(*nextp)->arg = arg;
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(*nextp)->next = NULL;
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return result;
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}
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static int mdays[12] = { 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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static int
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daysinmonth(const struct tm *t)
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{
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int year;
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year = t->tm_year + 1900;
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if (t->tm_mon == 1)
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if (!(year % 400))
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return 29;
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else if (!(year % 100))
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return 28;
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else if (!(year % 4))
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return 29;
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else
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return 28;
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else if (t->tm_mon >= 0 && t->tm_mon < 12)
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return mdays[t->tm_mon];
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return 0;
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}
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static int
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adjyear(struct tm *t, char type, int val)
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{
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switch (type) {
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case '+':
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t->tm_year += val;
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break;
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case '-':
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t->tm_year -= val;
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break;
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default:
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t->tm_year = val;
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if (t->tm_year < 69)
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t->tm_year += 100; /* as per date.c */
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else if (t->tm_year > 1900)
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t->tm_year -= 1900; /* struct tm holds years since 1900 */
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break;
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}
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return mktime(t) != -1;
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}
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static int
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adjmon(struct tm *t, char type, int val, int istext)
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{
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if (val < 0)
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return 0;
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switch (type) {
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case '+':
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if (istext)
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if (val <= t->tm_mon)
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val += 11 - t->tm_mon; /* early next year */
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else
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val -= t->tm_mon + 1; /* later this year */
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if (!adjyear(t, '+', (t->tm_mon + val) / 12))
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return 0;
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val %= 12;
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t->tm_mon += val;
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if (t->tm_mon > 11)
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t->tm_mon -= 12;
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break;
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case '-':
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if (istext)
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if (val-1 > t->tm_mon)
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val = 13 - val + t->tm_mon; /* later last year */
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else
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val = t->tm_mon - val + 1; /* early this year */
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if (!adjyear(t, '-', val / 12))
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return 0;
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val %= 12;
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if (val > t->tm_mon) {
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if (!adjyear(t, '-', 1))
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return 0;
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val -= 12;
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}
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t->tm_mon -= val;
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break;
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default:
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if (val > 12 || val < 1)
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return 0;
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t->tm_mon = --val;
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}
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return mktime(t) != -1;
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}
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static int
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adjday(struct tm *t, char type, int val)
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{
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int mdays;
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switch (type) {
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case '+':
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while (val) {
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mdays = daysinmonth(t);
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if (val > mdays - t->tm_mday) {
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val -= mdays - t->tm_mday + 1;
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t->tm_mday = 1;
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if (!adjmon(t, '+', 1, 0))
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return 0;
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} else {
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t->tm_mday += val;
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val = 0;
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}
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}
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break;
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case '-':
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while (val)
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if (val >= t->tm_mday) {
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val -= t->tm_mday;
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t->tm_mday = 1;
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if (!adjmon(t, '-', 1, 0))
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return 0;
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t->tm_mday = daysinmonth(t);
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} else {
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t->tm_mday -= val;
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val = 0;
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}
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break;
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default:
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if (val > 0 && val <= daysinmonth(t))
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t->tm_mday = val;
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else
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return 0;
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break;
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}
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return mktime(t) != -1;
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}
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static int
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adjwday(struct tm *t, char type, int val, int istext)
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{
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if (val < 0)
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return 0;
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switch (type) {
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case '+':
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if (istext)
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if (val < t->tm_wday)
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val = 7 - t->tm_wday + val; /* early next week */
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else
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val -= t->tm_wday; /* later this week */
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else
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val *= 7; /* "-W +5" == "5 weeks in the future" */
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return adjday(t, '+', val);
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case '-':
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if (istext)
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if (val > t->tm_wday)
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val = 7 - val + t->tm_wday; /* later last week */
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else
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val = t->tm_wday - val; /* early this week */
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else
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val *= 7; /* "-W -5" == "5 weeks ago" */
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return adjday(t, '-', val);
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default:
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if (val < t->tm_wday)
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return adjday(t, '-', t->tm_wday - val);
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else if (val > 6)
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return 0;
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else if (val > t->tm_wday)
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return adjday(t, '+', val - t->tm_wday);
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}
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return 1;
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}
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static int
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adjhour(struct tm *t, char type, int val)
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{
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if (val < 0)
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return 0;
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switch (type) {
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case '+':
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if (!adjday(t, '+', (t->tm_hour + val) / 24))
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return 0;
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val %= 24;
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t->tm_hour += val;
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if (t->tm_hour > 23)
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t->tm_hour -= 24;
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break;
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case '-':
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if (!adjday(t, '-', val / 24))
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return 0;
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val %= 24;
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if (val > t->tm_hour) {
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if (!adjday(t, '-', 1))
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return 0;
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val -= 24;
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}
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t->tm_hour -= val;
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break;
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default:
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if (val > 23)
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return 0;
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t->tm_hour = val;
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}
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return mktime(t) != -1;
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}
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static int
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adjmin(struct tm *t, char type, int val)
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{
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if (val < 0)
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return 0;
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switch (type) {
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case '+':
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if (!adjhour(t, '+', (t->tm_min + val) / 60))
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return 0;
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val %= 60;
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t->tm_min += val;
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if (t->tm_min > 59)
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t->tm_min -= 60;
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break;
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case '-':
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if (!adjhour(t, '-', val / 60))
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return 0;
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val %= 60;
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if (val > t->tm_min) {
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if (!adjhour(t, '-', 1))
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return 0;
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val -= 60;
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}
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t->tm_min -= val;
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break;
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default:
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if (val > 59)
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return 0;
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t->tm_min = val;
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}
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return mktime(t) != -1;
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}
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const struct vary *
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vary_apply(const struct vary *v, struct tm *t)
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{
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char type;
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char which;
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char *arg;
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int len;
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int val;
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for (; v; v = v->next) {
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type = *v->arg;
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arg = v->arg;
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if (type == '+' || type == '-')
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arg++;
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else
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type = '\0';
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len = strlen(arg);
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if (len < 2)
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return v;
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if (strspn(arg, digits) != len-1) {
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val = trans(trans_wday, arg);
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if (val != -1) {
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if (!adjwday(t, type, val, 1))
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return v;
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} else {
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val = trans(trans_mon, arg);
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if (val != -1) {
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if (!adjmon(t, type, val, 1))
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return v;
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} else
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return v;
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}
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} else {
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val = atoi(arg);
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which = arg[len-1];
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switch (which) {
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case 'M':
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if (!adjmin(t, type, val))
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return v;
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break;
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case 'H':
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if (!adjhour(t, type, val))
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return v;
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break;
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case 'd':
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if (!adjday(t, type, val))
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return v;
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break;
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case 'w':
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if (!adjwday(t, type, val, 0))
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return v;
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break;
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case 'm':
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if (!adjmon(t, type, val, 0))
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return v;
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break;
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case 'y':
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if (!adjyear(t, type, val))
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return v;
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break;
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default:
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return v;
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}
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}
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}
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return 0;
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}
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void
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vary_destroy(struct vary *v)
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{
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struct vary *n;
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while (v) {
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n = v->next;
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free(v);
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v = n;
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}
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}
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