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C style weird unmaintainable string type???
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#include <stdlib.h> | |
#include <stdio.h> | |
#define result(type) type ## Result | |
#define __decl_result(type) typedef struct type ## __result{ \ | |
type *value; \ | |
char* errorMsg; \ | |
} type ## Result; \ | |
\ | |
type ## Result type ## Result_complete(type ## Result *value) { \ | |
type ## Result r; \ | |
r.value = value; \ | |
r.errorMsg = 0; \ | |
return r; \ | |
}\ | |
\ | |
type ## Result type ## Result_fail(char* err) { \ | |
\ | |
type ## Result r; \ | |
r.errorMsg = err;\ | |
return r; \ | |
} | |
typedef struct stringArray { | |
int size; | |
char* array; | |
} StringArray; | |
__decl_result(StringArray) | |
void init_StringArray(StringArray* array) { | |
for (int i = 0; i < array->size; i++) { | |
array->array[i] = (char)0; | |
} | |
} | |
result(StringArray) __new_StringArray(int size) { | |
StringArray *strArray = (StringArray*)malloc(sizeof(StringArray)); | |
if (!strArray) { | |
return StringArrayResult_fail("could not allocate StringArray"); | |
} | |
strArray->size = size; | |
strArray->array = (char*)malloc(sizeof(char) * size + 1); | |
if (!strArray->array) { | |
return StringArrayResult_fail("could not allocate array"); | |
} | |
strArray->array[size] = '\0'; | |
return StringArrayResult_complete(strArray); | |
} | |
result(StringArray) new_StringArray(int size) { | |
result(StringArray) strArray = __new_StringArray(size); | |
if (strArray.errorMsg) { | |
return strArray; | |
} | |
init_StringArray(strArray.value); | |
return strArray; | |
} | |
char* resize_StringArray(StringArray* array, int newSize) { | |
if (array->size >= newSize) { | |
return; | |
} | |
free(array->array); | |
free(array); | |
result(StringArray) newResult = __new_StringArray(newSize); | |
if (newResult.errorMsg) { | |
return newResult.errorMsg; | |
} | |
array = newResult.value; | |
return 0; | |
} | |
char* set_StringArray(StringArray* array, char* string) { | |
int size = strlen(string); | |
if (size > array->size) { | |
char* err = resize_StringArray(array, size); | |
if (err) { | |
return err; | |
} | |
} | |
int i = 0; | |
for (; i < size; i++) { | |
array->array[i] = string[i]; | |
} | |
if (i < array->size) { | |
array->array[i] = '\0'; | |
} | |
return 0; | |
} | |
void handleError(char* c) { | |
if (c) { | |
printf("ERR: %s", c); | |
exit(1); | |
} | |
} | |
int main() | |
{ | |
result(StringArray) res_a = new_StringArray(4); | |
handleError(res_a.errorMsg); | |
StringArray* a = res_a.value; | |
printf("length : %d\n", a->size); | |
printf("content: %s\n", a->array); | |
char* err = set_StringArray(a, "hello world"); | |
handleError(err); | |
printf("length : %d\n", a->size); | |
printf("content: %s\n", a->array); | |
err = set_StringArray(a, "hello"); | |
handleError(err); | |
printf("length : %d\n", a->size); | |
printf("content: %s\n", a->array); | |
return 0; | |
} |
No
But consider this:
yes.
No
But consider this:
yes.
No
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