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Added comments for global variables

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This commit is contained in:
Kranklyboy 2018-05-08 14:14:19 +02:00
parent 662bbf673a
commit c8ddad3886
1 changed files with 103 additions and 41 deletions
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142
websh.c
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@ -1,6 +1,5 @@
/**
* @file websh.c
* @author Tobias Eidelpes <e01527193@student.tuwien.ac.at>
* @date 2018-04-16
*
* @brief Formats program output for the web.
@ -18,16 +17,46 @@
#include <sys/wait.h>
#define MAX_LEN 256
#define MAX_LINES 1024
/**
* @details Global variable for the program name.
*/
static const char *pname;
/**
* @details Global variable for the e-Flag.
*/
static int eFlag = 0;
/**
* @details Global variable for the h-Flag.
*/
static int hFlag = 0;
/**
* @details Global variable for the s-Flag.
*/
static int sFlag = 0;
/**
* @details Global variable for the supplied word.
*/
static const char *word;
/**
* @details Global variable for the supplied tag.
*/
static const char *tag;
/**
* @details Global array which saves the supplied linux commands.
*/
static char *lines[MAX_LINES] = {NULL};
/**
* @detals Variable which gets set on signal received.
*/
volatile sig_atomic_t quit = 0;
static void handle_signal(int signal)
@ -100,16 +129,42 @@ void parse(int argc, char *argv[])
pname = argv[0];
}
void child2(int fd[], char readbuffer[])
void child2(int fd[], char *line)
{
/* CHILD TWO */
char readbuffer[MAX_LEN];
close(fd[1]);
int nbytes = read(fd[0], readbuffer, MAX_LEN);
if (nbytes == -1) {
perror(pname);
exit(EXIT_FAILURE);
}
printf("%s", readbuffer);
readbuffer[nbytes-1] = '\0';
if (eFlag && (strcmp(line, lines[0]) == 0)) {
printf("<html><head></head><body>\n");
}
if (hFlag) {
char *pch = strstr(line, "\n");
if (pch != NULL)
strncpy(pch, "\0", 1);
printf("<h1>%s</h1>\n", line);
}
if (sFlag) {
if (strstr(readbuffer, word) != NULL) {
printf("<%s>%s</%s><br />\n", tag, readbuffer, tag);
} else {
printf("%s<br />\n", readbuffer);
}
} else {
printf("%s<br />\n", readbuffer);
}
int i = 0;
while (lines[i] != NULL) {
i++;
}
if (eFlag && (strcmp(line, lines[i-1]) == 0)) {
printf("</body></html>\n");
}
return;
}
@ -139,55 +194,62 @@ int main(int argc, char *argv[])
char *line = NULL;
size_t len = 0;
ssize_t nread;
char readbuffer[MAX_LEN];
int status;
int w;
if (eFlag)
printf("<html><head></head><body>\n");
int fd[2];
pid_t childpid1;
pid_t childpid2;
pipe(fd);
while ((nread = getline(&line, &len, stdin)) > 0) {
childpid1 = fork();
if (childpid1 > 0) {
/* PARENT ONE */
childpid2 = fork();
if (childpid2 > 0) {
/* PARENT TWO */
} else if (childpid2 == 0) {
/* CHILD TWO */
child2(fd, readbuffer);
} else {
perror(pname);
free(line);
exit(EXIT_FAILURE);
}
do {
w = waitpid(childpid2, &status, WUNTRACED | WCONTINUED);
if (w == -1) {
perror(pname);
exit(EXIT_FAILURE);
}
int count = 0;
if (WIFSIGNALED(status)) {
printf("Killed by signal %d\n", WTERMSIG(status));
} else if (WIFSTOPPED(status)) {
printf("Stopped by signal %d\n", WSTOPSIG(status));
} else if (WIFCONTINUED(status)) {
printf("Continued\n");
}
} while (!WIFEXITED(status) && !WIFSIGNALED(status));
} else if (childpid1 == 0) {
/* CHILD ONE */
child1(fd, line);
} else {
while ((nread = getline(&line, &len, stdin)) > 0) {
lines[count] = (char *) malloc (len);
strcpy(lines[count], line);
count++;
if (count == 1024)
break;
}
for (int i = 0; i < count; i++) {
switch (childpid1 = fork()) {
case -1:
perror(pname);
free(line);
exit(EXIT_FAILURE);
case 0:
child1(fd, lines[i]);
exit(EXIT_SUCCESS);
break;
default:
switch (childpid2 = fork()) {
case -1:
perror(pname);
free(line);
exit(EXIT_FAILURE);
case 0:
child2(fd, lines[i]);
exit(EXIT_SUCCESS);
break;
default:
do {
w = waitpid(-1, &status, WUNTRACED | WCONTINUED);
if (w == -1) {
perror(pname);
exit(EXIT_FAILURE);
}
if (WIFSIGNALED(status)) {
printf("Killed by signal %d\n", WTERMSIG(status));
} else if (WIFSTOPPED(status)) {
printf("Stopped by signal %d\n", WSTOPSIG(status));
} else if (WIFCONTINUED(status)) {
printf("Continued\n");
}
} while (!WIFEXITED(status) && !WIFSIGNALED(status));
break;
}
}
}