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libtest
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callbacks-example-filename2.c
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C/C++ Source or Header
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2006-06-04
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4KB
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128 lines
/*
How to build: (callback.so or callback.dll)
With GNU-GCC:
gcc -O -g3 -Wall -D_REENTRANT -shared -o mycallback.so callbacks-example.c -lhttrack1
With MS-Visual C++:
cl -LD -nologo -W3 -Zi -Zp4 -DWIN32 -Fe"mycallback.dll" callbacks-example.c libhttrack1.lib
Note: the httrack library linker option is only necessary when using libhttrack's functions inside the callback
How to use:
httrack --wrapper mycallback,string1,string2 ..
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Standard httrack module includes */
#include "httrack-library.h"
#include "htsopt.h"
#include "htsdefines.h"
/* Function definitions */
static int mysavename(t_hts_callbackarg *carg, httrackp *opt, const char* adr_complete, const char* fil_complete, const char* referer_adr, const char* referer_fil, char* save);
static int myend(t_hts_callbackarg *carg, httrackp *opt);
/* TOLOWER */
#define TOLOWER_(a) (a >= 'A' && a <= 'Z') ? (a + ('a' - 'A')) : a
#define TOLOWER(a) ( TOLOWER_( (a) ) )
/*
This sample just replaces all occurences of "string1" into "string2"
string1 and string2 are passed in the callback string:
httrack --wrapper save-name=callback:mysavename,string1,string2 ..
*/
typedef struct t_my_userdef {
char string1[256];
char string2[256];
} t_my_userdef;
/*
module entry point
*/
EXTERNAL_FUNCTION int hts_plug(t_hts_callbackarg *carg, httrackp *opt, const char* argv) {
const char *arg = strchr(argv, ',');
if (arg != NULL)
arg++;
/* Check args */
if (arg == NULL || *arg == '\0' || strchr(arg, ',') == NULL) {
fprintf(stderr, "** callback error: arguments expected or bad arguments\n");
fprintf(stderr, "usage: httrack --wrapper save-name=callback:mysavename,string1,string2\n");
fprintf(stderr, "example: httrack --wrapper save-name=callback:mysavename,foo,bar\n");
return 0; /* failed */
} else {
char *pos = strchr(arg, ',');
t_my_userdef *userdef = (t_my_userdef*) malloc(sizeof(t_my_userdef));
char * const string1 = userdef->string1;
char * const string2 = userdef->string2;
/* Split args */
fprintf(stderr, "** info: wrapper_init(%s) called!\n", arg);
fprintf(stderr, "** callback example: changing destination filename word by another one\n");
string1[0] = string1[1] = '\0';
strncat(string1, arg, pos - arg);
strcpy(string2, pos + 1);
fprintf(stderr, "** callback info: will replace %s by %s in filenames!\n", string1, string2);
/* Plug callback functions */
CHAIN_FUNCTION(opt, savename, mysavename, userdef);
CHAIN_FUNCTION(opt, end, myend, userdef);
}
return 1; /* success */
}
static int myend(t_hts_callbackarg *carg, httrackp *opt) {
t_my_userdef *userdef = (t_my_userdef*) CALLBACKARG_USERDEF(carg);
fprintf(stderr, "** info: wrapper_exit() called!\n");
if (userdef != NULL) {
free(userdef);
userdef = NULL;
}
/* Call parent functions if multiple callbacks are chained. */
if (CALLBACKARG_PREV_FUN(carg, end) != NULL) {
return CALLBACKARG_PREV_FUN(carg, end)(CALLBACKARG_PREV_CARG(carg), opt);
}
return 1; /* success */
}
static int mysavename(t_hts_callbackarg *carg, httrackp *opt, const char* adr_complete, const char* fil_complete, const char* referer_adr, const char* referer_fil, char* save) {
t_my_userdef *userdef = (t_my_userdef*) CALLBACKARG_USERDEF(carg);
char * const string1 = userdef->string1;
char * const string2 = userdef->string2;
/* */
char *buff, *a, *b;
/* Call parent functions if multiple callbacks are chained. */
if (CALLBACKARG_PREV_FUN(carg, savename) != NULL) {
if (!CALLBACKARG_PREV_FUN(carg, savename)(CALLBACKARG_PREV_CARG(carg), opt, adr_complete, fil_complete, referer_adr, referer_fil, save)) {
return 0; /* Abort */
}
}
/* Process */
buff = strdup(save);
a = buff;
b = save;
*b = '\0'; /* the "save" variable points to a buffer with "sufficient" space */
while(*a) {
if (strncmp(a, string1, (int)strlen(string1)) == 0) {
strcat(b, string2);
b += strlen(b);
a += strlen(string1);
} else {
*b++ = *a++;
*b = '\0';
}
}
free(buff);
return 1; /* success */
}