opendir segmentation fault
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#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<errno.h>
#include<dirent.h>
#include<unistd.h>
int makargv(const char*, const char*, char ***);
int main(int argc, char *argv[]){
if(argc != 2){
printf("Usage: %s search\n", argv[0]);
return -1;
}
char **pathToken;
char *pathVariable = NULL;
int i = 0;
if((pathVariable = getenv("PATH")) == NULL){
perror("Path Not Found");
return -1;
}
int tokenCount = makargv(pathVariable, ":", &pathToken);
DIR* dirPtr[tokenCount];
struct dirent *direntPtr[tokenCount];
for(i = 0; i < tokenCount; i++){
printf("%s\n", pathToken[i]);
dirPtr[i] = opendir(pathToken[i]);
while( (direntPtr[i] = readdir(dirPtr[i])) != NULL)
if(!strcmp(direntPtr[i]-> d_name, argv[1]))
printf("%s/%s\n", pathToken[i], argv[1]);
}
return 0;
}
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it gives seqmentation fault after 1st iteration of for loop. whats wrong with this ?
What's the value of tokenCount?
its 12
What is makargv? Do you have the source for it? If you do, why haven't you posted it?
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int makargv(const char* str, const char* delimiter, char ***argvp){
int tokens = 0;
int i, error;
const char *snew;
char *t;
if(str == NULL || delimiter == NULL || argvp == NULL){
errno = EINVAL;
return -1;
}
*argvp = NULL;
snew = str + strspn(str, delimiter);
if( (t = malloc(strlen(snew) + 1)) == NULL) return -1;
strcpy(t, snew);
if(strtok(t, delimiter) != NULL)
for(tokens = 1; strtok(NULL, delimiter); tokens++);
if((*argvp = malloc(tokens * sizeof (char *))) == NULL){
error = errno;
free(t);
errno = error;
return -1;
}
if(!tokens) free(t);
else{
strcpy(t, snew);
**argvp = strtok(t, delimiter);
for(i = 1; i < tokens; i++) *(*(argvp) + i) = strtok(NULL, delimiter);
}
*(*(argvp) + tokens) = NULL;
return tokens;
}
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k. here is the code for makargv, it just tokenize the string at given delimiter
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if((*argvp = malloc(tokens * sizeof (char *))) == NULL){
//...
*(*(argvp) + tokens) = NULL; //out of bounds
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nop, it worked now .. there was an error in opendir .. thanks
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