Parsing a text file, sorting lexigraphically and writing the output.

Here is code to parse a text file, sort it, and output it to another file.

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <ctype.h>

#include <math.h>

#define MAX_LINE_LEN 1024

typedef struct{

int arraySize;

int arrayElements;

char ** arrayPtr;

} da_string;

void da_string_Init(da_string * dal, int initialSize){

dal->arrayElements = 0;

dal->arraySize = initialSize;

dal->arrayPtr = (char **)malloc(sizeof(char *)*initialSize);

}

void da_string_Destroy(da_string * dal){

    int i;

    for(i = 0; i < dal->arrayElements; i++)

        free( dal->arrayPtr[i]);

    free(dal->arrayPtr);

    dal->arrayPtr = NULL;

dal->arrayElements = 0;

dal->arraySize = 0;

}

void da_string_AddItem(da_string * dal, char * item){

if(dal->arrayElements >= dal->arraySize){

dal->arraySize *= 2;    

dal->arrayPtr = (char ** ) realloc (dal->arrayPtr,  dal->arraySize * 

sizeof(char *));

}

dal->arrayPtr[dal->arrayElements++] = item;

}

char * da_string_GetItem(da_string * dal, int index){

return dal->arrayPtr[index];

}

int compareAscInt (const void * a, const void * b){

    return ( *(int*)a - *(int*)b );

}

int compareDcsString (const void * a, const void * b){

    return (strcmp(*(char **)b,*(char **)a));

}

FILE *inputFile = NULL;

FILE *outputFile = NULL;

da_string stringArray;

char lineBuffer[MAX_LINE_LEN];

int main(int argc, char *argv[]){

    

    if(argc != 3){

        fprintf(stderr, "error argg\n");

        return -1;

    }

    inputFile = fopen(argv[1], "r+"); //stdin is a valid file stream

    outputFile = fopen(argv[2],"w+");

da_string_Init(&stringArray,10);

    

    while ( fgets (lineBuffer, sizeof(lineBuffer), inputFile) != NULL){

        

        char temp[MAX_LINE_LEN];

        

        int i,j;

        for(i = 0,j = -1; i < MAX_LINE_LEN; i++){

            if(lineBuffer[i] == ','){

                j = i; 

                printf("%d\n",j);

            }

        }

        

        if(sscanf(lineBuffer,"%s",temp) == 1){

            

            int dataLen = strlen(temp) + 1;

            if(dataLen <= 1)

                continue;

            

            char  * data = calloc(dataLen,sizeof(char));

            data[dataLen - 1 ] = 0;

            

            strncpy(data,temp,dataLen);

            

            da_string_AddItem(&stringArray,data);

        }

    }

    qsort (stringArray.arrayPtr, stringArray.arrayElements, sizeof(char *), compareDcsString);

    

    int i;

    for(i = stringArray.arrayElements-1; i >= 0; i--){

        fprintf(outputFile,"%s\n",da_string_GetItem(&stringArray,i));

    }

    

    fclose (inputFile);

    fclose (outputFile);

    

da_string_Destroy(&stringArray);

    return 0;

}

 

Removing Hal From Gentoo

As you may know already hal has been depreciated, its functionally has been merged with udev. If you are having issues with hal or just want it removed then there are some things you need to know.

1. The first step to removing hal is to update your USE flags to exclude hal (USE="-hal"). 
2. Then update your system with emerge --update --deep --newuse world
3. Now you need to determine what packages require hal, these will have to be removed. Execute: emerge --depclean --verbose --pretend hal. 
4. You will now have a list of programs that you need to unmerge. In my case gnome-mount. I removed it after checking the dependencies with emerge --depclean gnome-mount.
5. Now once your system is clean of any dependencies to hal, remove it with emerge --unmerge hal.
6. Congratulations hal is no longer in control. I recommend you re-emerge xf86-input-evdev before restarting X, if you don't you may run into a situation where your mouse and keyboard are not recognized by X.