Hello, how can i compile this C code using option -std=c99 or -std=gnu99 #include <stdio.h> #include...
Hello, how can i compile this C code using option -std=c99 or -std=gnu99
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
static char* args[512];
pid_t pid;
int command_pipe[2];
static void waiting(int n);
static int command(int input, int first, int last)
{
int fd[2];
int flag=0;
pipe( fd );
pid = fork();
if (pid == 0) {
for(int i=0;args[i]!=0;i++)
{
if(args[i][0]=='>')
{
fd[1]=open(args[i+1], O_CREAT|O_TRUNC|O_WRONLY, 0644);
flag=1;
}
if(args[i]=='>>' )
{
fd[1]=open(args[i+1], O_APPEND|O_WRONLY, 0644);
flag=1;
}
}
if (first == 1 && last == 0 && input == 0) {
//fprintf(stderr, "here\n");
dup2( fd[1], 1 );
} else if (first == 0 && last == 0 && input != 0)
{
dup2(input, 0);
dup2(fd[1], 1);
} else {
if(flag==1)
{
dup2(fd[1],1);
}
dup2( input, 0 );
}
if(flag==1)
{
if(strcmp(args[1],">>")==0)
execlp(args[0], args[0], 0, (char *)0);
else if(strcmp(args[1],">")==0)
execlp(args[0], args[0], 0, (char *)0);
else
execlp(args[0], args[0], args[1], (char *)0);
}
else if (execvp( args[0], args) == -1)
exit(1);
}
if (input != 0)
close(input);
close(fd[1]);
if (last == 1)
close(fd[0]);
return fd[0];
}
static int run(char* cmd, int input, int first, int last);
static char line[1024];
static int n = 0; /* number of calls to 'command' */
int main()
{
printf("SIMPLE SHELL: Type 'exit' to exit.\n");
while (1) {
/* Print the command prompt */
printf("$$$ ");
fflush(NULL);
/* 0 a command line */
if (!fgets(line, 1024, stdin))
return 0;
int input = 0;
int first = 1;
char* cmd = line;
char* next = strchr(cmd, '|'); /* Find first '|' */
while (next != NULL) {
/* 'next' points to '|' */
*next = '\0';
input = run(cmd, input, first, 0);
cmd = next + 1;
next = strchr(cmd, '|'); /* Find next '|' */
first = 0;
}
input = run(cmd, input, first, 1);
waiting(n);
n = 0;
}
return 0;
}
static void tokenize(char* cmd);
static int run(char* cmd, int input, int first, int last)
{
tokenize(cmd);
if (args[0] != NULL) {
if (strcmp(args[0], "exit") == 0)
exit(0);
n += 1;
return command(input, first, last);
}
return 0;
}
static char* skipspace(char* s)
{
while (isspace(*s)) ++s;
return s;
}
static void tokenize(char* cmd)
{
cmd = skipspace(cmd);
char* next = strchr(cmd, ' ');
int i = 0;
while(next != NULL) {
next[0] = '\0';
args[i] = cmd;
++i;
cmd = skipspace(next + 1);
next = strchr(cmd, ' ');
}
if (cmd[0] != '\0') {
args[i] = cmd;
next = strchr(cmd, '\n');
next[0] = '\0';
++i;
}
args[i] = NULL;
}
static void waiting(int n)
{
int i;
for (i = 0; i < n; ++i)
wait(NULL);
}
Homework Answers
If you have any doubts, please give me comment...
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
static char *args[512];
pid_t pid;
int command_pipe[2];
static void waiting(int n);
static int command(int input, int first, int last)
{
int fd[2];
int flag = 0;
pipe(fd);
pid = fork();
if (pid == 0)
{
for (int i = 0; args[i] != 0; i++)
{
if (args[i][0] == '>')
{
fd[1] = open(args[i + 1], O_CREAT | O_TRUNC | O_WRONLY, 0644);
flag = 1;
}
if (strcmp(args[i], ">>")==0)
{
fd[1] = open(args[i + 1], O_APPEND | O_WRONLY, 0644);
flag = 1;
}
}
if (first == 1 && last == 0 && input == 0)
{
//fprintf(stderr, "here\n");
dup2(fd[1], 1);
}
else if (first == 0 && last == 0 && input != 0)
{
dup2(input, 0);
dup2(fd[1], 1);
}
else
{
if (flag == 1)
{
dup2(fd[1], 1);
}
dup2(input, 0);
}
if (flag == 1)
{
if (strcmp(args[1], ">>") == 0)
execlp(args[0], args[0], 0, (char *)0);
else if (strcmp(args[1], ">") == 0)
execlp(args[0], args[0], 0, (char *)0);
else
execlp(args[0], args[0], args[1], (char *)0);
}
else if (execvp(args[0], args) == -1)
exit(1);
}
if (input != 0)
close(input);
close(fd[1]);
if (last == 1)
close(fd[0]);
return fd[0];
}
static int run(char *cmd, int input, int first, int last);
static char line[1024];
static int n = 0; /* number of calls to 'command' */
int main()
{
printf("SIMPLE SHELL: Type 'exit' to exit.\n");
while (1)
{
/* Print the command prompt */
printf("$$$ ");
fflush(NULL);
/* 0 a command line */
if (!fgets(line, 1024, stdin))
return 0;
int input = 0;
int first = 1;
char *cmd = line;
char *next = strchr(cmd, '|'); /* Find first '|' */
while (next != NULL)
{
/* 'next' points to '|' */
*next = '\0';
input = run(cmd, input, first, 0);
cmd = next + 1;
next = strchr(cmd, '|'); /* Find next '|' */
first = 0;
}
input = run(cmd, input, first, 1);
waiting(n);
n = 0;
}
return 0;
}
static void tokenize(char *cmd);
static int run(char *cmd, int input, int first, int last)
{
tokenize(cmd);
if (args[0] != NULL)
{
if (strcmp(args[0], "exit") == 0)
exit(0);
n += 1;
return command(input, first, last);
}
return 0;
}
static char *skipspace(char *s)
{
while (isspace(*s))
++s;
return s;
}
static void tokenize(char *cmd)
{
cmd = skipspace(cmd);
char *next = strchr(cmd, ' ');
int i = 0;
while (next != NULL)
{
next[0] = '\0';
args[i] = cmd;
++i;
cmd = skipspace(next + 1);
next = strchr(cmd, ' ');
}
if (cmd[0] != '\0')
{
args[i] = cmd;
next = strchr(cmd, '\n');
next[0] = '\0';
++i;
}
args[i] = NULL;
}
static void waiting(int n)
{
int i;
for (i = 0; i < n; ++i)
wait(NULL);
}
Add Answer to:
Hello, how can i compile this C code using option -std=c99 or
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