Add loop in argument awk C - c

Question

I have Shell awk code:
awk '{sum+=$10; array[NR,1]=$11; array[NR,2]=$10; next;} END {
for (i = 1; i <= 10; i++)
printf "%3.0f'\.' %s \b '\-' %s \b '\-' %3.1f'\%' \n", i, array[i,1], array[i,2], array[i,2]/sum*100
}'
I make program on C:
int
main ()
{
const char *sort[] = { "sort", "-t", " ", "-k", "10", "-r", "-n", "log.txt", 0 };
const char *head[] = { "head", "-n 10", 0 };
const char *awk[] = { "awk", "{sum+=$10; array[NR,1]=$11; array[NR,2]=$10; next;} END { code there }", 0 };
struct command cmd [] = { {sort}, {head}, {awk} };
return fork_pipes (3, cmd);
}
I dont know how a correct to insert in argument - awk with END { loop code ... }
My task. Add to const char *awk[] = { "awk", ... }
'{sum+=$10; array[NR,1]=$11; array[NR,2]=$10; next;} END {
for (i = 1; i <= 10; i++)
printf "%3.0f'\.' %s \b '\-' %s \b '\-' %3.1f'\%' \n", i, array[i,1], array[i,2], array[i,2]/sum*100
}'
All code C:
#include <unistd.h>
struct command
{
const char **argv;
};
int
spawn_proc (int in, int out, struct command *cmd)
{
pid_t pid;
if ((pid = fork ()) == 0)
{
if (in != 0)
{
dup2 (in, 0);
close (in);
}
if (out != 1)
{
dup2 (out, 1);
close (out);
}
return execvp (cmd->argv [0], (char * const *)cmd->argv);
}
return pid;
}
int
fork_pipes (int n, struct command *cmd)
{
int i;
pid_t pid;
int in, fd [2];
/* The first process should get its input from the original file descriptor 0. */
in = 0;
/* Note the loop bound, we spawn here all, but the last stage of the pipeline. */
for (i = 0; i < n - 1; ++i)
{
pipe (fd);
/* f [1] is the write end of the pipe, we carry `in` from the prev iteration. */
spawn_proc (in, fd [1], cmd + i);
/* No need for the write and of the pipe, the child will write here. */
close (fd [1]);
/* Keep the read end of the pipe, the next child will read from there. */
in = fd [0];
}
/* Last stage of the pipeline - set stdin be the read end of the previous pipe
and output to the original file descriptor 1. */
if (in != 0)
dup2 (in, 0);
/* Execute the last stage with the current process. */
return execvp (cmd [i].argv [0], (char * const *)cmd [i].argv);
}
int
main ()
{
const char *sort[] = { "sort", "-t", " ", "-k", "10", "-r", "-n", "log.txt", 0 };
const char *head[] = { "head", "-n 10", 0 };
const char *awk[] = { "awk", "{sum+=$10; array[NR,1]=$11; array[NR,2]=$10; next;} END { code there }", 0 };
struct command cmd [] = { {sort}, {head}, {awk} };
return fork_pipes (3, cmd);
}

Answer 1

Assuming you don't know how to create the awk command string in C:
You can just put your awk program inline, but you have to escape all your quotes and backslashes;
Note: you can break that string into multiple lines (at least in C++, so I assume in C too):
const char* awk = "... END { "
"printf(\"%3.0f'\\.' %s \\b '\\-' %s \\b"
" '\\-' %3.1f'\\%' \\n\" "
"}";