Thu Oct 8 21:56:26 2009

Asterisk developer's documentation


func_cut.c File Reference

CUT function. More...

#include "asterisk.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"

Include dependency graph for func_cut.c:

Go to the source code of this file.

Data Structures

struct  sortable_keys

Defines

#define ERROR_NOARG   (-1)
#define ERROR_NOMEM   (-2)
#define ERROR_USAGE   (-3)
#define MAXRESULT   1024

Functions

static int acf_cut_exec (struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
static int acf_sort_exec (struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
 AST_MODULE_INFO_STANDARD (ASTERISK_GPL_KEY,"Cut out information from a string")
static int cut_internal (struct ast_channel *chan, char *data, char *buffer, size_t buflen)
static int load_module (void)
static int sort_internal (struct ast_channel *chan, char *data, char *buffer, size_t buflen)
static int sort_subroutine (const void *arg1, const void *arg2)
static int unload_module (void)

Variables

struct ast_custom_function acf_cut
struct ast_custom_function acf_sort


Detailed Description

CUT function.

Author:
Tilghman Lesher <app_cut__v003@the-tilghman.com>

Definition in file func_cut.c.


Define Documentation

#define ERROR_NOARG   (-1)

Definition at line 63 of file func_cut.c.

Referenced by acf_cut_exec(), acf_sort_exec(), cut_internal(), and sort_internal().

#define ERROR_NOMEM   (-2)

Definition at line 64 of file func_cut.c.

Referenced by acf_cut_exec(), acf_sort_exec(), and cut_internal().

#define ERROR_USAGE   (-3)

Definition at line 65 of file func_cut.c.

Referenced by acf_cut_exec(), and cut_internal().

#define MAXRESULT   1024

Definition at line 45 of file func_cut.c.

Referenced by cut_internal(), exec_exec(), and tryexec_exec().


Function Documentation

static int acf_cut_exec ( struct ast_channel chan,
char *  cmd,
char *  data,
char *  buf,
size_t  len 
) [static]

Definition at line 251 of file func_cut.c.

References ast_autoservice_start(), ast_autoservice_stop(), ast_log(), ast_module_user_add, ast_module_user_remove, cut_internal(), ERROR_NOARG, ERROR_NOMEM, ERROR_USAGE, and LOG_ERROR.

00252 {
00253    int ret = -1;
00254    struct ast_module_user *u = NULL;
00255 
00256    if (chan) {
00257       ast_autoservice_start(chan);
00258       u = ast_module_user_add(chan);
00259    }
00260 
00261    switch (cut_internal(chan, data, buf, len)) {
00262    case ERROR_NOARG:
00263       ast_log(LOG_ERROR, "Syntax: CUT(<varname>,<char-delim>,<range-spec>) - missing argument!\n");
00264       break;
00265    case ERROR_NOMEM:
00266       ast_log(LOG_ERROR, "Out of memory\n");
00267       break;
00268    case ERROR_USAGE:
00269       ast_log(LOG_ERROR, "Usage: CUT(<varname>,<char-delim>,<range-spec>)\n");
00270       break;
00271    case 0:
00272       ret = 0;
00273       break;
00274    default:
00275       ast_log(LOG_ERROR, "Unknown internal error\n");
00276    }
00277 
00278    if (chan) {
00279       ast_module_user_remove(u);
00280       ast_autoservice_stop(chan);
00281    }
00282 
00283    return ret;
00284 }

static int acf_sort_exec ( struct ast_channel chan,
char *  cmd,
char *  data,
char *  buf,
size_t  len 
) [static]

Definition at line 225 of file func_cut.c.

References ast_log(), ast_module_user_add, ast_module_user_remove, ERROR_NOARG, ERROR_NOMEM, LOG_ERROR, and sort_internal().

00226 {
00227    struct ast_module_user *u;
00228    int ret = -1;
00229 
00230    u = ast_module_user_add(chan);
00231 
00232    switch (sort_internal(chan, data, buf, len)) {
00233    case ERROR_NOARG:
00234       ast_log(LOG_ERROR, "SORT() requires an argument\n");
00235       break;
00236    case ERROR_NOMEM:
00237       ast_log(LOG_ERROR, "Out of memory\n");
00238       break;
00239    case 0:
00240       ret = 0;
00241       break;
00242    default:
00243       ast_log(LOG_ERROR, "Unknown internal error\n");
00244    }
00245 
00246    ast_module_user_remove(u);
00247 
00248    return ret;
00249 }

AST_MODULE_INFO_STANDARD ( ASTERISK_GPL_KEY  ,
"Cut out information from a string"   
)

static int cut_internal ( struct ast_channel chan,
char *  data,
char *  buffer,
size_t  buflen 
) [static]

Definition at line 118 of file func_cut.c.

References AST_APP_ARG, AST_DECLARE_APP_ARGS, ast_log(), AST_STANDARD_APP_ARGS, ast_strdupa, ERROR_NOARG, ERROR_NOMEM, ERROR_USAGE, LOG_WARNING, MAXRESULT, parse(), pbx_substitute_variables_helper(), and strsep().

Referenced by acf_cut_exec().

00119 {
00120    char *parse;
00121    AST_DECLARE_APP_ARGS(args,
00122       AST_APP_ARG(varname);
00123       AST_APP_ARG(delimiter);
00124       AST_APP_ARG(field);
00125    );
00126 
00127    memset(buffer, 0, buflen); 
00128 
00129    parse = ast_strdupa(data);
00130 
00131    AST_STANDARD_APP_ARGS(args, parse);
00132 
00133    /* Check and parse arguments */
00134    if(args.argc < 3){
00135       return ERROR_NOARG;
00136    } else {
00137       char d, ds[2];
00138       char *tmp = alloca(strlen(args.varname) + 4);
00139       char varvalue[MAXRESULT], *tmp2=varvalue;
00140 
00141       if (tmp) {
00142          snprintf(tmp, strlen(args.varname) + 4, "${%s}", args.varname);
00143          memset(varvalue, 0, sizeof(varvalue));
00144       } else {
00145          return ERROR_NOMEM;
00146       }
00147 
00148       if (args.delimiter[0] == '\\') {
00149          if (args.delimiter[1] == 'n')
00150             d = '\n';
00151          else if (args.delimiter[1] == 't')
00152             d = '\t';
00153          else if (args.delimiter[1] == 'r')
00154             d = '\r';
00155          else if (args.delimiter[1])
00156             d = args.delimiter[1];
00157          else
00158             d = '-';
00159       } else if (args.delimiter[0])
00160          d = args.delimiter[0];
00161       else
00162          d = '-';
00163 
00164       /* String form of the delimiter, for use with strsep(3) */
00165       snprintf(ds, sizeof(ds), "%c", d);
00166 
00167       pbx_substitute_variables_helper(chan, tmp, tmp2, MAXRESULT - 1);
00168 
00169       if (tmp2) {
00170          int curfieldnum = 1;
00171          while (tmp2 != NULL && args.field != NULL) {
00172             char *nextgroup = strsep(&(args.field), "&");
00173             int num1 = 0, num2 = MAXRESULT;
00174             char trashchar;
00175 
00176             if (sscanf(nextgroup, "%d-%d", &num1, &num2) == 2) {
00177                /* range with both start and end */
00178             } else if (sscanf(nextgroup, "-%d", &num2) == 1) {
00179                /* range with end */
00180                num1 = 0;
00181             } else if ((sscanf(nextgroup, "%d%c", &num1, &trashchar) == 2) && (trashchar == '-')) {
00182                /* range with start */
00183                num2 = MAXRESULT;
00184             } else if (sscanf(nextgroup, "%d", &num1) == 1) {
00185                /* single number */
00186                num2 = num1;
00187             } else {
00188                return ERROR_USAGE;
00189             }
00190 
00191             /* Get to start, if any */
00192             if (num1 > 0) {
00193                while (tmp2 != (char *)NULL + 1 && curfieldnum < num1) {
00194                   tmp2 = index(tmp2, d) + 1;
00195                   curfieldnum++;
00196                }
00197             }
00198 
00199             /* Most frequent problem is the expectation of reordering fields */
00200             if ((num1 > 0) && (curfieldnum > num1))
00201                ast_log(LOG_WARNING, "We're already past the field you wanted?\n");
00202 
00203             /* Re-null tmp2 if we added 1 to NULL */
00204             if (tmp2 == (char *)NULL + 1)
00205                tmp2 = NULL;
00206 
00207             /* Output fields until we either run out of fields or num2 is reached */
00208             while (tmp2 != NULL && curfieldnum <= num2) {
00209                char *tmp3 = strsep(&tmp2, ds);
00210                int curlen = strlen(buffer);
00211 
00212                if (curlen)
00213                   snprintf(buffer + curlen, buflen - curlen, "%c%s", d, tmp3);
00214                else
00215                   snprintf(buffer, buflen, "%s", tmp3);
00216 
00217                curfieldnum++;
00218             }
00219          }
00220       }
00221    }
00222    return 0;
00223 }

static int load_module ( void   )  [static]

Definition at line 322 of file func_cut.c.

References ast_custom_function_register().

00323 {
00324    int res = 0;
00325 
00326    res |= ast_custom_function_register(&acf_cut);
00327    res |= ast_custom_function_register(&acf_sort);
00328 
00329    return res;
00330 }

static int sort_internal ( struct ast_channel chan,
char *  data,
char *  buffer,
size_t  buflen 
) [static]

Definition at line 67 of file func_cut.c.

References ast_strdupa, ERROR_NOARG, sortable_keys::key, sort_subroutine(), strsep(), and sortable_keys::value.

Referenced by acf_sort_exec().

00068 {
00069    char *strings, *ptrkey, *ptrvalue;
00070    int count=1, count2, element_count=0;
00071    struct sortable_keys *sortable_keys;
00072 
00073    memset(buffer, 0, buflen);
00074 
00075    if (!data)
00076       return ERROR_NOARG;
00077 
00078    strings = ast_strdupa(data);
00079 
00080    for (ptrkey = strings; *ptrkey; ptrkey++) {
00081       if (*ptrkey == '|')
00082          count++;
00083    }
00084 
00085    sortable_keys = alloca(count * sizeof(struct sortable_keys));
00086 
00087    memset(sortable_keys, 0, count * sizeof(struct sortable_keys));
00088 
00089    /* Parse each into a struct */
00090    count2 = 0;
00091    while ((ptrkey = strsep(&strings, "|"))) {
00092       ptrvalue = index(ptrkey, ':');
00093       if (!ptrvalue) {
00094          count--;
00095          continue;
00096       }
00097       *ptrvalue++ = '\0';
00098       sortable_keys[count2].key = ptrkey;
00099       sscanf(ptrvalue, "%f", &sortable_keys[count2].value);
00100       count2++;
00101    }
00102 
00103    /* Sort the structs */
00104    qsort(sortable_keys, count, sizeof(struct sortable_keys), sort_subroutine);
00105 
00106    for (count2 = 0; count2 < count; count2++) {
00107       int blen = strlen(buffer);
00108       if (element_count++) {
00109          strncat(buffer + blen, ",", buflen - blen - 1);
00110          blen++;
00111       }
00112       strncat(buffer + blen, sortable_keys[count2].key, buflen - blen - 1);
00113    }
00114 
00115    return 0;
00116 }

static int sort_subroutine ( const void *  arg1,
const void *  arg2 
) [static]

Definition at line 52 of file func_cut.c.

References sortable_keys::value.

Referenced by sort_internal().

00053 {
00054    const struct sortable_keys *one=arg1, *two=arg2;
00055    if (one->value < two->value)
00056       return -1;
00057    else if (one->value == two->value)
00058       return 0;
00059    else
00060       return 1;
00061 }

static int unload_module ( void   )  [static]

Definition at line 310 of file func_cut.c.

References ast_custom_function_unregister(), and ast_module_user_hangup_all.

00311 {
00312    int res = 0;
00313 
00314    res |= ast_custom_function_unregister(&acf_cut);
00315    res |= ast_custom_function_unregister(&acf_sort);
00316 
00317    ast_module_user_hangup_all();
00318 
00319    return res;
00320 }


Variable Documentation

Definition at line 297 of file func_cut.c.

Definition at line 286 of file func_cut.c.


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