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make StringArrays NULL terminated

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This commit is contained in:
Chris Cromer 2021-07-16 14:16:53 -04:00
parent 1cbe850a10
commit 6c3f8259e9
2 changed files with 17 additions and 13 deletions
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16
src/array.c
View File

@ -23,6 +23,10 @@
*/ */
StringArray *create_string_array() { StringArray *create_string_array() {
StringArray *string_array = malloc(sizeof(StringArray)); StringArray *string_array = malloc(sizeof(StringArray));
if (string_array == NULL) {
perror("malloc");
exit(EXIT_FAILURE);
}
string_array->array = NULL; string_array->array = NULL;
string_array->size = 0; string_array->size = 0;
return string_array; return string_array;
@ -35,25 +39,30 @@ StringArray *create_string_array() {
*/ */
void insert_string_array(StringArray *string_array, char *string) { void insert_string_array(StringArray *string_array, char *string) {
if (string_array->size == 0) { if (string_array->size == 0) {
string_array->array = malloc(sizeof(char *)); string_array->array = malloc(2 * sizeof(char *));
if (string_array->array == NULL) { if (string_array->array == NULL) {
perror("malloc"); perror("malloc");
free_string_array(string_array);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
} }
else { else {
string_array->array = realloc(string_array->array, (string_array->size + 1) * sizeof(char *)); string_array->array = realloc(string_array->array, (string_array->size + 2) * sizeof(char *));
if (string_array->array == NULL) { if (string_array->array == NULL) {
perror("realloc"); perror("realloc");
free_string_array(string_array);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
} }
string_array->array[string_array->size] = malloc(sizeof(string)); string_array->array[string_array->size] = malloc(sizeof(string));
if (string_array->array == NULL) { if (string_array->array == NULL) {
perror("malloc"); perror("malloc");
free_string_array(string_array);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
strcpy(string_array->array[string_array->size], string); strcpy(string_array->array[string_array->size], string);
// A NULL terminated array
string_array->array[string_array->size + 1] = NULL;
string_array->size++; string_array->size++;
} }
@ -76,9 +85,10 @@ void delete_string_array(StringArray *string_array, int index) {
} }
free(string_array->array[string_array->size - 1]); free(string_array->array[string_array->size - 1]);
string_array->array[string_array->size - 1] = NULL; string_array->array[string_array->size - 1] = NULL;
string_array->array = realloc(string_array->array, (string_array->size - 1) * sizeof(char *)); string_array->array = realloc(string_array->array, (string_array->size) * sizeof(char *));
if (string_array->array == NULL) { if (string_array->array == NULL) {
perror("realloc"); perror("realloc");
free_string_array(string_array);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
string_array->size--; string_array->size--;

10
src/launch.c
View File

@ -30,18 +30,12 @@ void launch_program(StringArray *args) {
child = fork(); child = fork();
if (child == 0) { if (child == 0) {
// Copy the array and add a NULL to the end of it if (execvp(args->array[0], args->array) == -1) {
char *argv[args->size + 1];
for (size_t i = 0; i < args->size; i++) {
argv[i] = args->array[i];
}
argv[args->size] = NULL;
execvp(args->array[0], argv);
fprintf(stderr, "%s: command not found\n", args->array[0]); fprintf(stderr, "%s: command not found\n", args->array[0]);
free_string_array(args); free_string_array(args);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
}
else if (child < 0) { else if (child < 0) {
perror("fork"); perror("fork");
} }