| 1 | /* |
| 2 | * at time mon day |
| 3 | * at time wday |
| 4 | * at time wday 'week' |
| 5 | * |
| 6 | */ |
| 7 | #include <stdio.h> |
| 8 | #include <ctype.h> |
| 9 | #include <time.h> |
| 10 | #include <signal.h> |
| 11 | |
| 12 | #define HOUR 100 |
| 13 | #define HALFDAY (12*HOUR) |
| 14 | #define DAY (24*HOUR) |
| 15 | #define THISDAY "/usr/spool/at" |
| 16 | |
| 17 | char *days[] = { |
| 18 | "sunday", |
| 19 | "monday", |
| 20 | "tuesday", |
| 21 | "wednesday", |
| 22 | "thursday", |
| 23 | "friday", |
| 24 | "saturday", |
| 25 | }; |
| 26 | |
| 27 | struct monstr { |
| 28 | char *mname; |
| 29 | int mlen; |
| 30 | } months[] = { |
| 31 | { "january", 31 }, |
| 32 | { "february", 28 }, |
| 33 | { "march", 31 }, |
| 34 | { "april", 30 }, |
| 35 | { "may", 31 }, |
| 36 | { "june", 30 }, |
| 37 | { "july", 31 }, |
| 38 | { "august", 31 }, |
| 39 | { "september", 30 }, |
| 40 | { "october", 31 }, |
| 41 | { "november", 30 }, |
| 42 | { "december", 31 }, |
| 43 | { 0, 0 }, |
| 44 | }; |
| 45 | |
| 46 | char fname[100]; |
| 47 | int utime; /* requested time in grains */ |
| 48 | int now; /* when is it */ |
| 49 | int uday; /* day of year to be done */ |
| 50 | int uyear; /* year */ |
| 51 | int today; /* day of year today */ |
| 52 | FILE *file; |
| 53 | FILE *ifile; |
| 54 | char **environ; |
| 55 | char *prefix(); |
| 56 | FILE *popen(); |
| 57 | |
| 58 | main(argc, argv) |
| 59 | char **argv; |
| 60 | { |
| 61 | extern onintr(); |
| 62 | register c; |
| 63 | char pwbuf[100]; |
| 64 | FILE *pwfil; |
| 65 | int larg; |
| 66 | |
| 67 | /* argv[1] is the user's time: e.g., 3AM */ |
| 68 | /* argv[2] is a month name or day of week */ |
| 69 | /* argv[3] is day of month or 'week' */ |
| 70 | /* another argument might be an input file */ |
| 71 | if (argc < 2) { |
| 72 | fprintf(stderr, "at: arg count\n"); |
| 73 | exit(1); |
| 74 | } |
| 75 | makeutime(argv[1]); |
| 76 | larg = makeuday(argc,argv)+1; |
| 77 | if (uday==today && larg<=2 && utime<=now) |
| 78 | uday++; |
| 79 | c = uyear%4==0? 366: 365; |
| 80 | if (uday >= c) { |
| 81 | uday -= c; |
| 82 | uyear++; |
| 83 | } |
| 84 | filename(THISDAY, uyear, uday, utime); |
| 85 | ifile = stdin; |
| 86 | if (argc > larg) |
| 87 | ifile = fopen(argv[larg], "r"); |
| 88 | if (ifile == NULL) { |
| 89 | fprintf(stderr, "at: cannot open input: %s\n", argv[larg]); |
| 90 | exit(1); |
| 91 | } |
| 92 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
| 93 | signal(SIGINT, onintr); |
| 94 | file = fopen(fname, "a"); |
| 95 | chmod(fname, 0644); |
| 96 | if (file == NULL) { |
| 97 | fprintf(stderr, "at: cannot open memo file\n"); |
| 98 | exit(1); |
| 99 | } |
| 100 | if ((pwfil = popen("pwd", "r")) == NULL) { |
| 101 | fprintf(stderr, "at: can't execute pwd\n"); |
| 102 | exit(1); |
| 103 | } |
| 104 | fgets(pwbuf, 100, pwfil); |
| 105 | pclose(pwfil); |
| 106 | fprintf(file, "cd %s", pwbuf); |
| 107 | if (environ) { |
| 108 | char **ep = environ; |
| 109 | while(*ep) |
| 110 | fprintf(file, "%s\n", *ep++); |
| 111 | } |
| 112 | while((c = getc(ifile)) != EOF) { |
| 113 | putc(c, file); |
| 114 | } |
| 115 | exit(0); |
| 116 | } |
| 117 | |
| 118 | makeutime(pp) |
| 119 | char *pp; |
| 120 | { |
| 121 | register val; |
| 122 | register char *p; |
| 123 | |
| 124 | /* p points to a user time */ |
| 125 | p = pp; |
| 126 | val = 0; |
| 127 | while(isdigit(*p)) { |
| 128 | val = val*10+(*p++ -'0'); |
| 129 | } |
| 130 | if (p-pp < 3) |
| 131 | val *= HOUR; |
| 132 | |
| 133 | for (;;) { |
| 134 | switch(*p) { |
| 135 | |
| 136 | case ':': |
| 137 | ++p; |
| 138 | if (isdigit(*p)) { |
| 139 | if (isdigit(p[1])) { |
| 140 | val +=(10* *p + p[1] - 11*'0'); |
| 141 | p += 2; |
| 142 | continue; |
| 143 | } |
| 144 | } |
| 145 | fprintf(stderr, "at: bad time format:\n"); |
| 146 | exit(1); |
| 147 | |
| 148 | case 'A': |
| 149 | case 'a': |
| 150 | if (val >= HALFDAY+HOUR) |
| 151 | val = DAY+1; /* illegal */ |
| 152 | if (val >= HALFDAY && val <(HALFDAY+HOUR)) |
| 153 | val -= HALFDAY; |
| 154 | break; |
| 155 | |
| 156 | case 'P': |
| 157 | case 'p': |
| 158 | if (val >= HALFDAY+HOUR) |
| 159 | val = DAY+1; /* illegal */ |
| 160 | if (val < HALFDAY) |
| 161 | val += HALFDAY; |
| 162 | break; |
| 163 | |
| 164 | case 'n': |
| 165 | case 'N': |
| 166 | val = HALFDAY; |
| 167 | break; |
| 168 | |
| 169 | case 'M': |
| 170 | case 'm': |
| 171 | val = 0; |
| 172 | break; |
| 173 | |
| 174 | |
| 175 | case '\0': |
| 176 | case ' ': |
| 177 | /* 24 hour time */ |
| 178 | if (val == DAY) |
| 179 | val -= DAY; |
| 180 | break; |
| 181 | |
| 182 | default: |
| 183 | fprintf(stderr, "at: bad time format\n"); |
| 184 | exit(1); |
| 185 | |
| 186 | } |
| 187 | break; |
| 188 | } |
| 189 | if (val < 0 || val >= DAY) { |
| 190 | fprintf(stderr, "at: time out of range\n"); |
| 191 | exit(1); |
| 192 | } |
| 193 | if (val%HOUR >= 60) { |
| 194 | fprintf(stderr, "at: illegal minute field\n"); |
| 195 | exit(1); |
| 196 | } |
| 197 | utime = val; |
| 198 | } |
| 199 | |
| 200 | |
| 201 | makeuday(argc,argv) |
| 202 | char **argv; |
| 203 | { |
| 204 | /* the presumption is that argv[2], argv[3] are either |
| 205 | month day OR weekday [week]. Returns either 2 or 3 as last |
| 206 | argument used */ |
| 207 | /* first of all, what's today */ |
| 208 | long tm; |
| 209 | int found = -1; |
| 210 | char **ps; |
| 211 | struct tm *detail, *localtime(); |
| 212 | struct monstr *pt; |
| 213 | |
| 214 | time(&tm); |
| 215 | detail = localtime(&tm); |
| 216 | uday = today = detail->tm_yday; |
| 217 | uyear = detail->tm_year; |
| 218 | now = detail->tm_hour*100+detail->tm_min; |
| 219 | if (argc<=2) |
| 220 | return(1); |
| 221 | /* is the next argument a month name ? */ |
| 222 | for (pt=months; pt->mname; pt++) { |
| 223 | if (prefix(argv[2], pt->mname)) { |
| 224 | if (found<0) |
| 225 | found = pt-months; |
| 226 | else { |
| 227 | fprintf(stderr, "at: ambiguous month\n"); |
| 228 | exit(1); |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | if (found>=0) { |
| 233 | if (argc<=3) |
| 234 | return(2); |
| 235 | uday = atoi(argv[3]) - 1; |
| 236 | if (uday<0) { |
| 237 | fprintf(stderr, "at: illegal day\n"); |
| 238 | exit(1); |
| 239 | } |
| 240 | while(--found>=0) |
| 241 | uday += months[found].mlen; |
| 242 | if (detail->tm_year%4==0 && uday>59) |
| 243 | uday += 1; |
| 244 | return(3); |
| 245 | } |
| 246 | /* not a month, try day of week */ |
| 247 | found = -1; |
| 248 | for (ps=days; ps<days+7; ps++) { |
| 249 | if (prefix(argv[2], *ps)) { |
| 250 | if (found<0) |
| 251 | found = ps-days; |
| 252 | else { |
| 253 | fprintf(stderr, "at: ambiguous day of week\n"); |
| 254 | exit(1); |
| 255 | } |
| 256 | } |
| 257 | } |
| 258 | if (found<0) |
| 259 | return(1); |
| 260 | /* find next day of this sort */ |
| 261 | uday = found - detail->tm_wday; |
| 262 | if (uday<=0) |
| 263 | uday += 7; |
| 264 | uday += today; |
| 265 | if (argc>3 && strcmp("week", argv[3])==0) { |
| 266 | uday += 7; |
| 267 | return(3); |
| 268 | } |
| 269 | return(2); |
| 270 | } |
| 271 | |
| 272 | char * |
| 273 | prefix(begin, full) |
| 274 | char *begin, *full; |
| 275 | { |
| 276 | int c; |
| 277 | while (c = *begin++) { |
| 278 | if (isupper(c)) |
| 279 | c = tolower(c); |
| 280 | if (*full != c) |
| 281 | return(0); |
| 282 | else |
| 283 | full++; |
| 284 | } |
| 285 | return(full); |
| 286 | } |
| 287 | |
| 288 | filename(dir, y, d, t) |
| 289 | char *dir; |
| 290 | { |
| 291 | register i; |
| 292 | |
| 293 | for (i=0; ; i += 53) { |
| 294 | sprintf(fname, "%s/%02d.%03d.%04d.%02d", dir, y, d, t, |
| 295 | (getpid()+i)%100); |
| 296 | if (access(fname, 0) == -1) |
| 297 | return; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | onintr() |
| 302 | { |
| 303 | unlink(fname); |
| 304 | exit(1); |
| 305 | } |