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83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* Calendar file v1.0. Copyright 1994 by Christopher Neufeld */
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/* The executable for this file contains linked runtime libraries
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copyrighted by The Byte Works. Used with permission. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <time.h>
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#include <ctype.h>
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#pragma stacksize 512
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#define NMONTHS 12
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#define NDAYS 31
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#define MAXLINELEN 255
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#define CALFILE "calendar"
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#define SECSPERDAY (24 * 60 * 60)
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const char months[NMONTHS][] = {"jan", "feb", "mar", "apr", "may", "jun",
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"jul", "aug", "sep", "oct", "nov", "dec"};
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int main(void)
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{
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FILE *ifile;
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time_t t1, t2;
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struct tm st1, st2;
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int monthnum, daynum, dayschk, i, j;
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char *ptr1, *ptr2, holdmnth[4];
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static char thislin[MAXLINELEN+1];
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long deltat;
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if ((ifile = fopen(CALFILE, "r")) == NULL) exit(0);
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t1 = time(NULL);
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st1 = *localtime(&t1);
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st1.tm_sec = st1.tm_min = st1.tm_hour = 0;
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t1 = mktime(&st1);
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dayschk = (st1.tm_wday >= 5) ? 8 - st1.tm_wday : 1;
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thislin[MAXLINELEN] = 0;
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while (!feof(ifile)) {
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fgets(thislin, MAXLINELEN, ifile);
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ptr1 = thislin;
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while (isspace(*ptr1) && *ptr1 != 0) ptr1++;
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if (*ptr1 == 0) continue; /* Blank line */
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monthnum = -1;
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if (isdigit(*ptr1)) { /* month/day format */
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monthnum = strtoul(ptr1, &ptr2, 10) - 1;
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daynum = strtoul(ptr2+1, NULL, 10);
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if (monthnum < 0 || monthnum >= NMONTHS || daynum < 0 || daynum > NDAYS)
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continue;
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} else {
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for (i=0; i<3; i++) holdmnth[i] = tolower(ptr1[i]);
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holdmnth[3] = 0;
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for (i = 0; i < NMONTHS; i++)
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if (!(strcmp(holdmnth, months[i]))) {
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monthnum = i;
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break;
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}
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if (monthnum == -1) continue;
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while (!isspace(*ptr1) && *ptr1 != 0) ptr1++;
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if (*ptr1 == 0) continue;
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while (isspace(*ptr1) && *ptr1 != 0) ptr1++;
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if (*ptr1 == 0) continue;
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daynum = atoi(ptr1);
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if (daynum < 1 || daynum > NDAYS) continue;
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}
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st2.tm_sec = st2.tm_min = st2.tm_hour = st2.tm_isdst = 0;
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st2.tm_mday = daynum;
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st2.tm_mon = monthnum;
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st2.tm_year = st1.tm_year;
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t2 = mktime(&st2);
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if ((deltat = difftime(t2, t1)) < 0) { /* Next year */
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st2.tm_year++;
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t2 = mktime(&st2);
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deltat = difftime(t2, t1);
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}
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if (deltat <= dayschk * SECSPERDAY) printf(thislin);
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}
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fclose(ifile);
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exit(0);
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}
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