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

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