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verifycmd.h
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verifycmd.h
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#ifndef ajsi
#define ajsi
int getwords(char *inpt){
cnt=0;
char *ch = strtok (inpt,"\" \t");
while (ch){
strcpy(input[cnt++],ch);
ch = strtok (NULL, " \"\t");
}
return cnt;
}
void verify_cmd(char *inpt){
cnt = getwords(inpt);
int fd,i,pos1 =(-1),pos2=(-1);
int fl = cnt;
for(i=0;i<cnt;i++)
{
if(input[i][0] == '<')
{
fd=open(input[i+1], O_RDONLY);
if(fd < 0) {
perror("fd error");
return ;
} else if(dup2(fd,0) == -1) {
perror("dup error");
return ;
}
close(fd);
pos1 = i;
if(pos1 < fl)
fl = pos1;
}
else if(input[i][0] == '>')
{
if(input[i][1] == '>')
fd=open(input[i+1],O_CREAT | O_WRONLY |O_APPEND, 0666);
else{
fd=open(input[i+1], O_CREAT | O_WRONLY | O_TRUNC, 0666);
}
if(fd < 0) {
perror("fd error");
return ;
} else if(dup2(fd,1) == -1) {
perror("dup error");
return ;
}
close(fd);
pos2 = i;
if(pos2 < fl)
fl = pos2;
}
}
if(pos1 != -1)
memset(input[pos1],0,sizeof(input[pos1]));
if(pos2 != -1)
memset(input[pos2],0,sizeof(input[pos2]));
cnt = fl;
if (!strcmp(input[0], "cd")){
implement_cd();
}
else if (!strcmp(input[0],"c")) {
strcpy(input[0],"clear");execute(cnt);
}
else if (!strcmp(input[0],"echo")) {
echo();
printf("\n");
}
else if (!strcmp(input[0],"pwd")){
char temp[1023] = {'\0'};
getcwd(temp,sizeof (temp));
printf("%s\n",temp);
}
else if (!strcmp(input[0],"ls")){
ls();
}
else if(!strcmp(input[0],"pinfo")){
if(!strlen(input[1])){
pin(1);
}
else{
pin(0);
}
}
else if(!strcmp(input[0],"quit")){
exit(0);
}
else if(!strcmp(input[0],"setenv")){
if(cnt!=2 && cnt!=3){
perror("input error");
return;
}
else setenv(input[1],input[2],1);
}
else if(!strcmp(input[0],"unsetenv")){
if(cnt!=2){
perror("input error");
return;
}
else unsetenv(input[1]);
}
else if(!strcmp(input[0],"jobs")){
jobs();
}
else if(!strcmp(input[0],"overkill")){
overkill();
}
else if(!strcmp(input[0],"kjob")){
if(cnt!=3){
perror("invalid input format");
return;
}
kjob();
}
else if(!strcmp(input[0],"fg")){
fg();
}
else if(!strcmp(input[0],"bg")){
bg();
}
else{
execute(cnt);
}
dup2(in,0);
dup2(out,1);
}
#endif