dstr

Reference counted dynamic string and string containers

Use it to ease the work with strings in C. Doxygen documentation is available by generating it from source.

Author: John Abrahamsen JhnAbrhmsn@gmail.com.

Its simple:

	dstr *str = dstr_with_initial("concat me");
	dstr *str2 = dstr_with_initial(" to me");
	
	dstr_append(str, str2);
        printf("%s", dstr_from_dstr_to_cstr(str));
	dstr_decref(str);
	dstr_decref(str2);

Containers

Implementations of both linked lists, dstr_list, and vectors, dstr_vector, are provided.

It's also simple:

	dstr_vector *vector = dstr_vector_new();
	dstr_vector_push_back_decref(vector, dstr_with_initial("First string"));
	dstr_vector_push_back_decref(vector, dstr_with_initial("Second string"));
	
	while(!dstr_vector_is_empty(vector)){
		dstr_print(dstr_vector_back(vector));
		dstr_vector_pop_back(vector);
	}
	
	dstr_vector_decref(vector);

No more memory management is needed. dstr library provides functions for containers that will either decrement reference or not, depending on usage.

Performance

All benchmarks are done on Ubuntu 11.04 and Lenovo W510.

Strings:

    dstr *str = dstr_new();
    int i;

    for (i = 0; i < 1000000; i++){
        dstr_append_cstr(str, "concat me onto something...");
    }

    dstr_decref(str);

Without DST_MEM_CLEAR defined (zero bytes previous used string buffers before freeing):

Test: test_some_concating ... time used for 1000000 appends: 0 seconds 50 milliseconds. passed

With DST_MEM_CLEAR:

Test: test_some_concating ... time used for 1000000 appends: 0 seconds 660 milliseconds. passed

Vectors:

    dstr *str = dstr_with_initial("append me");
    dstr_vector *vec = dstr_vector_new();
    int i;

    for (i = 0; i < 1000000; i++){
        dstr_vector_push_back(vec, str);
    }

    dstr_vector_decref(vec);
    dstr_decref(str);

Without DSTR_MEM_SECURITY (boundary protection for operations get/set/remove operations):

• Test: test_vector_append_speed ... time used for 1000000 push_back to vector: 0 seconds 60 milliseconds. passed
• Test: test_vector_append_speed_no_prealloc ... time used for 1000000 push_back to vector: 0 seconds 70 milliseconds. passed
• Test: test_vector_append_front_speed ... time used for 20000 push_front to vector: 2 seconds 140 milliseconds. passed

With DSTR_MEM_SECURITY defined:

• Test: test_vector_append_speed ... time used for 1000000 push_back to vector: 0 seconds 70 milliseconds. passed
• Test: test_vector_append_speed_no_prealloc ... time used for 1000000 push_back to vector: 0 seconds 70 milliseconds. passed
• Test: test_vector_append_front_speed ... time used for 20000 push_front to vector: 2 seconds 140 milliseconds. passed

Lists:

• Test: test_list_speed ... time used for 1000000 insertion to list: 0 seconds 110 milliseconds. passed

License

Copyright 2012 John Abrahamsen jhnabrhmsn@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.