Videos :: Code Snippets
Written by: Kiran Kankipati - Published: 16-Mar-2017
Watch Video: 323 The Purpose of writing a software code - Expressing Skills vs Addressing Requirement![]()
* Click the image above to watch this video on Youtube ↗
Watch Video: 228 writing custom Shell or CLI via readline library in C and PHP![]()
* Click the image above to watch this video on Youtube ↗ Download this episode's my sample source code HERE.
And here is the source code for a quick reference.
/* testcli.c
* The Linux Channel
* Author: Kiran Kankipati
* Updated: 05-Jul-2017
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
unsigned char command_buf[500];
void main()
{
while(1)
{
printf("testcli> ");
scanf("%s", command_buf);
//gets(command_buf);
if(!strcmp(command_buf, "ifconfig")) { system("ifconfig"); }
else if(!strcmp(command_buf, "date")) { system("date"); }
else if(!strcmp(command_buf, "ls")) { system("ls"); }
else if(!strcmp(command_buf, "exit") || !strcmp(command_buf, "quit") || !strcmp(command_buf, "e") || !strcmp(command_buf, "q")) { break; }
}
}
/* testcli_readline.c
* The Linux Channel
* Author: Kiran Kankipati
* Updated: 05-Jul-2017
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <readline/readline.h>
#include <readline/history.h>
//Install if not installed !!
//sudo apt-get install libreadline6 libreadline6-dev
unsigned char *command_buf;
void main()
{
while(1)
{
command_buf = readline("testcli_readline> ");
if(strlen(command_buf)>0) { add_history(command_buf); }
if(!strcmp(command_buf, "ifconfig")) { system("ifconfig"); }
else if(!strcmp(command_buf, "date")) { system("date"); }
else if(!strcmp(command_buf, "ls")) { system("ls"); }
else if(!strcmp(command_buf, "exit") || !strcmp(command_buf, "quit") || !strcmp(command_buf, "e") || !strcmp(command_buf, "q")) { break; }
}
}
/* testcli_readline.php
* The Linux Channel
* Author: Kiran Kankipati
* Updated: 05-Jul-2017
*/
$prompt = `hostname`;
$prompt .= "#testcli_readline> ";
while(1)
{ $command_buf = readline($prompt);
if(strlen($command_buf)>0) { readline_add_history($command_buf); }
if(!strcmp($command_buf, "ifconfig")) { system("ifconfig"); }
else if(!strcmp($command_buf, "date")) { system("date"); }
else if(!strcmp($command_buf, "ls")) { system("ls"); }
else if(!strcmp($command_buf, "exit") || !strcmp($command_buf, "quit") || !strcmp($command_buf, "e") || !strcmp($command_buf, "q")) { break; }
}
Watch Video: 200 Coding a simple look-up-table in C - without Linked lists and a binary search![]()
* Click the image above to watch this video on Youtube ↗ Download this episode's my sample source code HERE.
And here is the source code for a quick reference.
/* lookuptable.c - coding a look-up-table in C
* The Linux Channel
* Author: Kiran Kankipati
* Updated: 16-mar-2017
*/
#include <stdio.h>
#include <stdbool.h>
typedef struct __mytable_
{ int value;
char name[50];
bool enable;
} mytable_t;
#define MAX_ENTRIES 100
mytable_t mytable_array[MAX_ENTRIES];
bool init_mytable()
{ int i=0;
for(i=0;i<MAX_ENTRIES;i++) { mytable_array[i].enable=false; }
}
void print_mytable()
{ int i=0;
printf("mytable_array[] contents\n");
for(i=0;i<MAX_ENTRIES;i++) { if(mytable_array[i].enable==true) printf("[%d] - value: %d\n", i, mytable_array[i].value); }
printf("------------------------\n\n");
}
void add_item_mytable(int value)
{ int i=0;
//check for duplicate ?
for(i=0;i<MAX_ENTRIES;i++) { if(mytable_array[i].enable==true) { if(mytable_array[i].value==value) { return; } } }
//add item
for(i=0;i<MAX_ENTRIES;i++) { if(mytable_array[i].enable==false) { mytable_array[i].value=value; mytable_array[i].enable=true; return; } }
}
void del_item_mytable(int value)
{ int i=0;
//check for match ?
for(i=0;i<MAX_ENTRIES;i++) { if(mytable_array[i].enable==true) { if(mytable_array[i].value==value) { mytable_array[i].enable=false; return; } } }
}
int find_item_mytable(int value)
{ int i=0;
//check for match ?
for(i=0;i<MAX_ENTRIES;i++) { if(mytable_array[i].enable==true) { if(mytable_array[i].value==value) { return i; } } }
}
void main()
{
init_mytable(); print_mytable();
add_item_mytable(5); print_mytable();
add_item_mytable(3); print_mytable();
add_item_mytable(1); print_mytable();
add_item_mytable(2); print_mytable();
del_item_mytable(3); print_mytable();
printf("value: %d is in position [%d]\n", 1, find_item_mytable(1));
}
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