-8
如果我有一个像矩阵或树的数据结构，并且我想从包含上述变量的非常大的函数中分解出一个for循环，那么调用应该如何进行？我尝试了以下，但我得到了分段错误。如何选择函数原型的类型？
void write_command(int w, char *argv[], char *string[]) {
char *dest;
for (int r = 0; argv[r] != NULL; r++) {
dest = malloc(sizeof(char *) * strlen(argv[r]) + 1);
*dest = '0';
strcpy(dest, argv[r]);
string[w][r] = *dest;
free(dest);
}
}
我想你看看我在做什么，但我该如何声明变量？我在string[w][r] = *dest;处遇到段错误。
我不认为你想看看我在重构什么，但它是有史以来最大，最难读的功能。
static int runCmd(const char *cmd) {
const char *cp;
pid_t pid;
int status;
struct command structcommand[15];
char **argv = 0;
int argc = 1;
bool pipe = false;
char *string[z][z];
char *pString3[40];
char *pString2[40];
int n = 0;
char **ptr1;
char string1[z];
bool keep = false;
char *pString1[z];
char *pString[z];
*pString1 = "\0";
*pString = "\0";
char *temp = {'\0'};
int w = 0;
bool b = false;
int j = 0;
int i;
int p = 0;
char **ptr;
char *tmpchar;
char *cmdtmp;
bool b1 = false;
char *dest;
int y = 0;
i = 0;
int h = 0;
nullterminate(string);
if (cmd) {
for (cp = cmd; *cp; cp++) {
if ((*cp >= 'a') && (*cp <= 'z')) {
continue;
}
if ((*cp >= 'A') && (*cp <= 'Z')) {
continue;
}
if (isDecimal(*cp)) {
continue;
}
if (isBlank(*cp)) {
continue;
}
if ((*cp == '.') || (*cp == '/') || (*cp == '-') ||
(*cp == '+') || (*cp == '=') || (*cp == '_') ||
(*cp == ':') || (*cp == ',') || (*cp == '\'') ||
(*cp == '"')) {
continue;
}
}
}
if (cmd) {
cmdtmp = malloc(sizeof(char *) * strlen(cmd) + 1);
strcpy(cmdtmp, cmd);
tmpchar = malloc(sizeof(char *) * strlen(cmd) + 1);
if (tmpchar == NULL) {
printf("Error allocating memory!\n"); /* print an error message */
return 1; /* return with failure */
}
strcpy(tmpchar, cmd);
ptr1 = str_split(pString3, cmdtmp, '|');
if (strstr(cmd, "|") == NULL) { /* not a pipeline */
makeArgs(cmd, &argc, (const char ***) &argv, pipe, 0, 0);
for (j = 0; j < argc; j++) {
string[0][j] = argv[j];
structcommand[i].argv = string[0]; /*process;*/
}
n++;
}
else {
for (i = 0; *(ptr1 + i); i++) { /* tokenize the input string for each pipeline*/
n++; /* save number of pipelines */
int e = 0; /* a counter */
*pString = "\0"; /* should malloc and free this? */
strcpy(string1, *(ptr1 + i));
if ((string1[0] != '\0') && !isspace(string1[0])) { /* this is neither the end nor a new argument */
ptr = str_split(pString2, *(&string1), ' '); /* split the string at the arguments */
h = 0;
for (j = 0; *(ptr + j); j++) { /* step through the arguments */
/* the pipeline is in cmdtmp and the argument/program is in ptr[i] */
if (ptr + j && !b && strstr(*(ptr + j), "'")) {
b = true;
strcpy(temp, *(ptr + j));
if (y < 1) {
y++;
}
}
while (b) {
if (*(ptr + j) && strstr(*(ptr + j), "'")) { /* end of quote */
b = false;
if (y < 1) {
string[i][j] = strcpy(temp, *(ptr + j));
}
y = 0;
}
else if (*(ptr + j)) { /* read until end of quote */
string[i][j] = temp;
continue;
} else {
b = false;
break;
}
}
if (ptr + j) {
if (*(ptr + j)[0] == '{') {
keep = true;
}
if (testFn(*(ptr + j))) { /* test for last char */
string[i][j - p] = concat(*pString1, *(ptr + j));
keep = false;
free(*pString1);
goto mylabel;
}
if (keep) {
*pString1 = concat(*pString1, *(ptr + j));
*pString1 = concat(*pString1, " ");
p++;
} else {
// strcpy(temp, *(ptr + j));
b1 = false;
int q = j;
for (e = 0; *(ptr + q + e); e++) { /* step through the string */
b1 = true;
if (*(ptr + e + q)) {
*pString = concat(*pString, *(ptr + e + q));
*pString = concat(*pString, " ");
}
j = e;
}
if (makeArgs(*pString, &argc, (const char ***) &argv, pipe, i, h)) {
write_command(&w, argv, string[w]);
/*for (int r = 0; argv[r] != NULL; r++) {
dest = malloc(sizeof(char *) * strlen(argv[r]) + 1);
*dest = '0';
strcpy(dest, argv[r]);
string[w][r] = dest;
}*/
w++;
} else {
if (!b1) { /* no args (?) */
for (int r = 0; argv[r] != NULL; r++) {
string[i][r] = argv[r];
}
}
}
}
}
}
mylabel:
free(ptr);
dump_argv((const char *) "d", argc, argv);
}
}
free(ptr1);
free(cmdtmp);
free(tmpchar);
}
for (i = 0; i < n; i++) {
for (j = 0; DEBUG && string[i][j] != NULL; j++) {
if (i == 0 && j == 0) printf("\n");
printf("p[%d][%d] %s\n", i, j, string[i][j]);
}
structcommand[i].argv = string[i];
}
fflush(NULL);
pid = fork();
if (pid < 0) {
perror("fork failed");
return -1;
}
/* If we are the child process, then go execute the string.*/
if (pid == 0) {
/* spawn(cmd);*/
fork_pipes(n, structcommand);
}
/*
* We are the parent process.
* Wait for the child to complete.
*/
status = 0;
while (((pid = waitpid(pid, &status, 0)) < 0) && (errno == EINTR));
if (pid < 0) {
fprintf(stderr, "Error from waitpid: %s", strerror(errno));
return -1;
}
if (WIFSIGNALED(status)) {
fprintf(stderr, "pid %ld: killed by signal %d\n",
(long) pid, WTERMSIG(status));
return -1;
}
}
return WEXITSTATUS(status);
}
是'char * string []'错字'char * string [z] [z]'实例或其他变量？ – user3078414
不，实际上，它不清楚你想要做什么。我最好的猜测是，你正试图对给定的'argv'数组做一个深层次的拷贝，但是在这种情况下，你根本不清楚你开始的变量声明char * string [z] [z]; '，符合图片。也不清楚为什么你似乎在函数内释放分配的内存。 –
我试图重构一个大功能，将一个for-loop分解成一个函数并调用函数，但我不习惯传递指针，因为我是OOP。关键的见解是要理解我不需要传递矩阵作为参数，传递矩阵可以作为数组完成。现在我尝试为我的下一个重构传递一个'struct'，并且我遇到了类似的问题，因为我不是专家级的C程序员。 –