vcs.maemo.org Git - monky/blob - src/mboxscan.c

   1 /* Conky, a system monitor, based on torsmo
   2  *
   3  * Any original torsmo code is licensed under the BSD license
   4  *
   5  * All code written since the fork of torsmo is licensed under the GPL
   6  *
   7  * Please see COPYING for details
   8  *
   9  * Copyright (c) 2006 Marco Candrian <mac@calmar.ws>
  10  * Copyright (c) 2005-2007 Brenden Matthews, Philip Kovacs, et. al.
  11  *      (see AUTHORS)
  12  * All rights reserved.
  13  *
  14  * This program is free software: you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation, either version 3 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25  *
  26  * $Id$ */
  27
  28 #include "conky.h"
  29 #include <sys/stat.h>
  30 #include <sys/time.h>
  31 #include <errno.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include "mboxscan.h"
  36
  37 #define FROM_WIDTH 10
  38 #define SUBJECT_WIDTH 22
  39 #define PRINT_MAILS 5
  40 #define TIME_DELAY 5
  41
  42 struct ring_list {
  43         char *from;
  44         char *subject;
  45         struct ring_list *previous;
  46         struct ring_list *next;
  47 };
  48
  49 static time_t last_ctime;       /* needed for mutt at least */
  50 static time_t last_mtime;       /* not sure what to test: testing both now */
  51 static double last_update;
  52
  53 static int args_ok = 0;
  54 static int from_width;
  55 static int subject_width;
  56 static int print_mails;
  57 static int time_delay;
  58
  59 /* I don't know what to use: TEXT_BUFFER_SIZE or text_buffer_size
  60  * text_buffer_size is the maximum output in chars
  61  * TEXT_BUFFER_SIZE actually something like a allowed size for things in the
  62  * config, below 'TEXT'. Or what is more probably max_user_text.
  63  * Anyway, I used TEXT_BUFFER_SIZE for not 'output' things here
  64  * -- calmar
  65  *
  66  * To clarify, TEXT_BUFFER_SIZE is used for buffers of fixed size, and
  67  * text_buffer_size is used for buffers which can change in size.
  68  * text_buffer_size is just defined as TEXT_BUFFER_SIZE to start, so it's okay
  69  * for most things, however if something is allocated with text_buffer_size and
  70  * then text_buffer_size changes but the array doesn't, you might have some
  71  * issues if you are using text_buffer_size to determine the size of the array.
  72  * -- brenden */
  73
  74 static char mbox_mail_spool[TEXT_BUFFER_SIZE];
  75
  76 void mbox_scan(char *args, char *output, size_t max_len)
  77 {
  78         int i, u, flag;
  79         int force_rescan = 0;
  80         char buf[text_buffer_size];
  81         struct stat statbuf;
  82
  83         /* output was set to 1 after malloc'ing in conky.c */
  84         /* -> beeing able to test it here for catching SIGUSR1 */
  85         if (output[0] == 1) {
  86                 force_rescan = 1;
  87                 output[0] = '\0';
  88         }
  89
  90         if (!args_ok || force_rescan) {
  91
  92                 char *substr = strstr(args, "-n");
  93
  94                 if (substr) {
  95                         if (sscanf(substr, "-n %i", &print_mails) != 1) {
  96                                 print_mails = PRINT_MAILS;
  97                         }
  98                 } else {
  99                         print_mails = PRINT_MAILS;
 100                 }
 101                 if (print_mails < 1) {
 102                         print_mails = 1;
 103                 }
 104
 105                 substr = strstr(args, "-t");
 106                 if (substr) {
 107                         if (sscanf(substr, "-t %i", &time_delay) != 1) {
 108                                 time_delay = TIME_DELAY;
 109                         }
 110                 } else {
 111                         time_delay = TIME_DELAY;
 112                 }
 113
 114                 substr = strstr(args, "-fw");
 115                 if (substr) {
 116                         if (sscanf(substr, "-fw %i", &from_width) != 1) {
 117                                 from_width = FROM_WIDTH;
 118                         }
 119                 } else {
 120                         from_width = FROM_WIDTH;
 121                 }
 122
 123                 substr = strstr(args, "-sw");
 124                 if (substr) {
 125                         if (sscanf(substr, "-sw %i", &subject_width) != 1) {
 126                                 subject_width = SUBJECT_WIDTH;
 127                         }
 128                 } else {
 129                         subject_width = SUBJECT_WIDTH;
 130                 }
 131                 /* encapsulated with "'s find first occurrence of " */
 132                 if (args[strlen(args) - 1] == '"') {
 133                         strncpy(mbox_mail_spool, args, TEXT_BUFFER_SIZE);
 134                         char *start = strchr(mbox_mail_spool, '"') + 1;
 135
 136                         start[(long) (strrchr(mbox_mail_spool, '"') - start)] = '\0';
 137                         strncpy(mbox_mail_spool, start, TEXT_BUFFER_SIZE);
 138                 } else {
 139                         char *copy_args = strdup(args);
 140                         char *tmp = strtok(copy_args, " ");
 141                         char *start = tmp;
 142
 143                         while (tmp) {
 144                                 tmp = strtok(NULL, " ");
 145                                 if (tmp) {
 146                                         start = tmp;
 147                                 }
 148                         }
 149                         strncpy(mbox_mail_spool, start, TEXT_BUFFER_SIZE);
 150                         free(copy_args);
 151                 }
 152                 if (strlen(mbox_mail_spool) < 1) {
 153                         CRIT_ERR("Usage: ${mboxscan [-n <number of messages to print>] "
 154                                 "[-fw <from width>] [-sw <subject width>] "
 155                                 "[-t <delay in sec> mbox]}");
 156                 }
 157
 158                 /* allowing $MAIL in the config */
 159                 if (!strcmp(mbox_mail_spool, "$MAIL")) {
 160                         strcpy(mbox_mail_spool, current_mail_spool);
 161                 }
 162
 163                 if (stat(mbox_mail_spool, &statbuf)) {
 164                         CRIT_ERR("can't stat %s: %s", mbox_mail_spool, strerror(errno));
 165                 }
 166                 args_ok = 1;    /* args-computing necessary only once */
 167         }
 168
 169         /* if time_delay not yet reached, then return */
 170         if (current_update_time - last_update < time_delay && !force_rescan) {
 171                 return;
 172         }
 173
 174         last_update = current_update_time;
 175
 176         /* mbox still exists? and get stat-infos */
 177         if (stat(mbox_mail_spool, &statbuf)) {
 178                 ERR("can't stat %s: %s", mbox_mail_spool, strerror(errno));
 179                 output[0] = '\0';       /* delete any output */
 180                 return;
 181         }
 182
 183         /* modification time has not changed, so skip scanning the box */
 184         if (statbuf.st_ctime == last_ctime && statbuf.st_mtime == last_mtime
 185                         && !force_rescan) {
 186                 return;
 187         }
 188
 189         last_ctime = statbuf.st_ctime;
 190         last_mtime = statbuf.st_mtime;
 191
 192         /* build up double-linked ring-list to hold data, while scanning down the
 193          * mbox */
 194         struct ring_list *curr = 0, *prev = 0, *startlist = 0;
 195
 196         for (i = 0; i < print_mails; i++) {
 197                 curr = (struct ring_list *) malloc(sizeof(struct ring_list));
 198                 curr->from = (char *) malloc(sizeof(char[from_width + 1]));
 199                 curr->subject = (char *) malloc(sizeof(char[subject_width + 1]));
 200                 curr->from[0] = '\0';
 201                 curr->subject[0] = '\0';
 202
 203                 if (i == 0) {
 204                         startlist = curr;
 205                 }
 206                 if (i > 0) {
 207                         curr->previous = prev;
 208                         prev->next = curr;
 209                 }
 210                 prev = curr;
 211         }
 212
 213         /* connect end to start for an endless loop-ring */
 214         startlist->previous = curr;
 215         curr->next = startlist;
 216
 217         /* mbox */
 218         FILE *fp;
 219
 220         fp = fopen(mbox_mail_spool, "r");
 221         if (!fp) {
 222                 return;
 223         }
 224
 225         /* first find a "From " to set it to 0 for header-sarchings */
 226         flag = 1;
 227         while (!feof(fp)) {
 228                 if (fgets(buf, text_buffer_size, fp) == NULL) {
 229                         break;
 230                 }
 231
 232                 if (strncmp(buf, "From ", 5) == 0) {
 233                         curr = curr->next;
 234
 235                         /* skip until \n */
 236                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 237                                 fgets(buf, text_buffer_size, fp);
 238                         }
 239
 240                         flag = 0;       /* in the headers now */
 241                         continue;
 242                 }
 243
 244                 if (flag == 1) {        /* in the body, so skip */
 245                         continue;
 246                 }
 247
 248                 if (buf[0] == '\n') {
 249                         /* beyond the headers now (empty line), skip until \n */
 250                         /* then search for new mail ("From ") */
 251
 252                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 253                                 fgets(buf, text_buffer_size, fp);
 254                         }
 255                         flag = 1;       /* in the body now */
 256                         continue;
 257                 }
 258
 259                 if ((strncmp(buf, "X-Status: ", 10) == 0)
 260                                 || (strncmp(buf, "Status: R", 9) == 0)) {
 261
 262                         /* Mail was read or something, so skip that message */
 263                         flag = 1;       /* search for next From */
 264                         curr->subject[0] = '\0';
 265                         curr->from[0] = '\0';
 266                         /* (will get current again on new 'From ' finding) */
 267                         curr = curr->previous;
 268                         /* Skip until \n */
 269                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 270                                 fgets(buf, text_buffer_size, fp);
 271                         }
 272                         continue;
 273                 }
 274
 275                 /* that covers ^From: and ^from: ^From:<tab> */
 276                 if (strncmp(buf + 1, "rom:", 4) == 0) {
 277
 278                         i = 0;
 279                         u = 6;  /* no "From: " string needed, so skip */
 280                         while (1) {
 281
 282                                 if (buf[u] == '"') {    /* no quotes around names */
 283                                         u++;
 284                                         continue;
 285                                 }
 286
 287                                 /* some are: From: <foo@bar.com> */
 288                                 if (buf[u] == '<' && i > 1) {
 289
 290                                         curr->from[i] = '\0';
 291                                         /* skip until \n */
 292                                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 293                                                 fgets(buf, text_buffer_size, fp);
 294                                         }
 295                                         break;
 296                                 }
 297
 298                                 if (buf[u] == '\n') {
 299                                         curr->from[i] = '\0';
 300                                         break;
 301                                 }
 302
 303                                 if (buf[u] == '\0') {
 304                                         curr->from[i] = '\0';
 305                                         break;
 306                                 }
 307
 308                                 if (i >= from_width) {
 309                                         curr->from[i] = '\0';
 310                                         /* skip until \n */
 311                                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 312                                                 fgets(buf, text_buffer_size, fp);
 313                                         }
 314                                         break;
 315                                 }
 316
 317                                 /* nothing special so just set it */
 318                                 curr->from[i++] = buf[u++];
 319                         }
 320                 }
 321
 322                 /* that covers ^Subject: and ^subject: and ^Subjec:<tab> */
 323                 if (strncmp(buf + 1, "ubject:", 7) == 0) {
 324
 325                         i = 0;
 326                         u = 9;  /* no "Subject: " string needed, so skip */
 327                         while (1) {
 328
 329                                 if (buf[u] == '\n') {
 330                                         curr->subject[i] = '\0';
 331                                         break;
 332                                 }
 333                                 if (buf[u] == '\0') {
 334                                         curr->subject[i] = '\0';
 335                                         break;
 336                                 }
 337                                 if (i >= subject_width) {
 338                                         curr->subject[i] = '\0';
 339
 340                                         /* skip until \n */
 341                                         while (strchr(buf, '\n') == NULL && !feof(fp)) {
 342                                                 fgets(buf, text_buffer_size, fp);
 343                                         }
 344                                         break;
 345                                 }
 346
 347                                 /* nothing special so just set it */
 348                                 curr->subject[i++] = buf[u++];
 349                         }
 350                 }
 351         }
 352
 353         fclose(fp);
 354
 355         output[0] = '\0';
 356         struct ring_list *tmp;
 357
 358         i = print_mails;
 359         while (i) {
 360                 if (curr->from[0] != '\0') {
 361                         if (i != print_mails) {
 362                                 snprintf(buf, text_buffer_size, "\nF: %-*s S: %-*s", from_width,
 363                                         curr->from, subject_width, curr->subject);
 364                         } else {        /* first time - no \n in front */
 365                                 snprintf(buf, text_buffer_size, "F: %-*s S: %-*s", from_width,
 366                                         curr->from, subject_width, curr->subject);
 367                         }
 368                 } else {
 369                         snprintf(buf, text_buffer_size, "\n");
 370                 }
 371                 strncat(output, buf, max_len - strlen(output));
 372
 373                 tmp = curr;
 374                 curr = curr->previous;
 375                 free(tmp->from);
 376                 free(tmp->subject);
 377                 free(tmp);
 378
 379                 i--;
 380         }
 381 }