Mercurial > hg > toybox
annotate toys/posix/cal.c @ 1388:c4f5f82adce6 draft
Implement -HL for cp.
| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Mon, 14 Jul 2014 05:38:27 -0500 |
| parents | fc1bb49e58a9 |
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| rev | line source |
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1 /* cal.c - show calendar. |
| 394 | 2 * |
| 3 * Copyright 2011 Rob Landley <rob@landley.net> | |
| 4 * | |
| 5 * See http://opengroup.org/onlinepubs/9699919799/utilities/cal.html | |
| 6 | |
| 7 USE_CAL(NEWTOY(cal, ">2", TOYFLAG_USR|TOYFLAG_BIN)) | |
| 8 | |
| 9 config CAL | |
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10 bool "cal" |
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11 default y |
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12 help |
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13 usage: cal [[month] year] |
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14 |
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15 Print a calendar. |
| 394 | 16 |
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17 With one argument, prints all months of the specified year. |
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18 With two arguments, prints calendar for month and year. |
| 394 | 19 */ |
| 20 | |
| 21 #include "toys.h" | |
| 22 | |
| 23 // Write calendar into buffer: each line is 20 chars wide, end indicated | |
| 24 // by empty string. | |
| 25 | |
| 26 static char *calstrings(char *buf, struct tm *tm) | |
| 27 { | |
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28 char temp[21]; |
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29 int wday, mday, start, len, line; |
| 394 | 30 |
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31 // header |
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32 len = strftime(temp, 21, "%B %Y", tm); |
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33 len += (20-len)/2; |
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34 buf += sprintf(buf, "%*s%*s ", len, temp, 20-len, ""); |
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35 buf++; |
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36 buf += sprintf(buf, "Su Mo Tu We Th Fr Sa "); |
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37 buf++; |
| 394 | 38 |
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39 // What day of the week does this month start on? |
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40 if (tm->tm_mday>1) |
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41 start = (36+tm->tm_wday-tm->tm_mday)%7; |
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42 else start = tm->tm_wday; |
| 394 | 43 |
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44 // What day does this month end on? Alas, libc doesn't tell us... |
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45 len = 31; |
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46 if (tm->tm_mon == 1) { |
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47 int year = tm->tm_year; |
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48 len = 28; |
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49 if (!(year & 3) && !((year&100) && !(year&400))) len++; |
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50 } else if ((tm->tm_mon+(tm->tm_mon>6 ? 1 : 0)) & 1) len = 30; |
| 394 | 51 |
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52 for (mday=line=0;line<6;line++) { |
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53 for (wday=0; wday<7; wday++) { |
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54 char *pat = " "; |
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55 if (!mday ? wday==start : mday<len) { |
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56 pat = "%2d "; |
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57 mday++; |
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58 } |
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59 buf += sprintf(buf, pat, mday); |
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60 } |
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61 buf++; |
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62 } |
| 394 | 63 |
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64 return buf; |
| 394 | 65 } |
| 66 | |
| 67 void xcheckrange(long val, long low, long high) | |
| 68 { | |
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69 char *err = "%ld %s than %ld"; |
| 394 | 70 |
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71 if (val < low) error_exit(err, val, "less", low); |
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72 if (val > high) error_exit(err, val, "greater", high); |
| 394 | 73 } |
| 74 | |
| 75 // Worst case scenario toybuf usage: sizeof(struct tm) plus 21 bytes/line | |
| 76 // plus 8 lines/month plus 12 months, comes to a bit over 2k of our 4k buffer. | |
| 77 | |
| 78 void cal_main(void) | |
| 79 { | |
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80 struct tm *tm; |
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81 char *buf = toybuf; |
| 394 | 82 |
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83 if (toys.optc) { |
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84 // Conveniently starts zeroed |
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85 tm = (struct tm *)toybuf; |
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86 buf += sizeof(struct tm); |
| 394 | 87 |
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88 // Last argument is year, one before that (if any) is month. |
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89 xcheckrange(tm->tm_year = atol(toys.optargs[--toys.optc]),1,9999); |
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90 tm->tm_year -= 1900; |
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91 tm->tm_mday = 1; |
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92 tm->tm_hour = 12; // noon to avoid timezone weirdness |
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93 if (toys.optc) { |
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94 xcheckrange(tm->tm_mon = atol(toys.optargs[--toys.optc]),1,12); |
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95 tm->tm_mon--; |
| 394 | 96 |
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97 // Print 12 months of the year |
| 394 | 98 |
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99 } else { |
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100 char *bufs[12]; |
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101 int i, j, k; |
| 394 | 102 |
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103 for (i=0; i<12; i++) { |
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104 tm->tm_mon=i; |
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105 mktime(tm); |
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106 buf = calstrings(bufs[i]=buf, tm); |
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107 } |
| 394 | 108 |
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109 // 4 rows, 6 lines each, 3 columns |
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110 for (i=0; i<4; i++) { |
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111 for (j=0; j<8; j++) { |
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112 for(k=0; k<3; k++) { |
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113 char **b = bufs+(k+i*3); |
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114 *b += printf("%s ", *b); |
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115 } |
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116 puts(""); |
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117 } |
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118 } |
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119 return; |
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120 } |
| 394 | 121 |
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122 // What day of the week does that start on? |
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123 mktime(tm); |
| 394 | 124 |
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125 } else { |
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126 time_t now; |
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127 time(&now); |
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128 tm = localtime(&now); |
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129 } |
| 394 | 130 |
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131 calstrings(buf, tm); |
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132 while (*buf) buf += printf("%s\n", buf); |
| 394 | 133 } |