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Add utility functions for copying strings.

This commit is contained in:
Danila Fedorin 2018-03-06 16:45:55 -08:00
parent bb26405df0
commit 45d955b8bd
2 changed files with 45 additions and 0 deletions
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27
include/util.h
View File

@ -4,6 +4,7 @@
#include "libds.h"
#include "liblex.h"
#include "result.h"
#include <string.h>
/**
* Converts a result code from liblex to libabacus.
@ -17,5 +18,31 @@ libab_result libab_convert_lex_result(liblex_result to_convert);
* @return the libabacus equivalent of the error code.
*/
libab_result libab_convert_ds_result(libds_result to_convert);
/**
* Copies a range of the given string into a new, null-terminated string allocated
* on the heap.
* @param destination the pointer to populate with the newly created string.
* @param source the source from which to pull character information from.
* @param from the index (inclusive) at which to begin copying.
* @param to the index (exclusive) at which to end copying.
* @return the result of the operation.
*/
libab_result libab_copy_string_range(char** destination, const char* source, size_t from, size_t to);
/**
* Copies the given string, starting at 0 and copying length bytes.
* @param destination the pointer to populate with the newly created string.
* @param source to source string to copy.
* @param length the number of bytes to copy.
* @return the result of the operation.
*/
libab_result libab_copy_string_size(char** destination, const char* source, size_t length);
/**
* Copies the entire string into a null-terminated string allocated
* on the heap.
* @param destination the pointer to populate with the newly allocated string.
* @param source the source string to copy.
* @return the result of the operation.
*/
libab_result libab_copy_string(char** destination, const char* source);
#endif

18
src/util.c
View File

@ -1,4 +1,5 @@
#include "util.h"
#include <stdlib.h>
libab_result libab_convert_lex_result(liblex_result to_convert) {
libab_result result = LIBAB_SUCCESS;
@ -18,3 +19,20 @@ libab_result libab_convert_ds_result(libds_result to_convert) {
}
return result;
}
libab_result libab_copy_string_range(char** destination, const char* source, size_t from, size_t to) {
libab_result result = LIBAB_SUCCESS;
size_t string_length = to - from;
if((*destination = malloc(string_length + 1)) == NULL) {
result = LIBAB_MALLOC;
} else {
strncpy(*destination, source + from, string_length);
(*destination)[string_length] = '\0';
}
return result;
}
libab_result libab_copy_string_size(char** destination, const char* source, size_t length) {
return libab_copy_string_range(destination, source, 0, length);
}
libab_result libab_copy_string(char** destination, const char* source) {
return libab_copy_string_range(destination, source, 0, strlen(source));
}