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Struct N_STR Struct N_TIFF Struct N_TIFF_ENTRY Struct N_TIME Struct N_URL Struct N_URL_PARAM Struct N_USER Struct N_USERLIST Struct N_WS_CONN Struct N_WS_FRAME Struct N_WS_MESSAGE Struct N_ZIP_MEMBER Struct OCTREE Struct OCTREE_NODE Struct PARSER Struct PARTICLE Struct PARTICLE_EMITTER Struct PARTICLE_SYSTEM Struct PEER Struct PHYSICS Struct PK_OBJ Struct PK_VM Struct POINT2D Struct POINT3D Struct PRETTY_OUT Struct QNODE Struct QUADTREE Struct QUADTREE_NODE Struct REC Struct RGB Struct SAMPLE Struct SEEN Struct SHARER Struct SRV Struct SRV_ARG Struct STACK Struct STACK_ITEM Struct SYNTAX_RUN Struct THREAD_POOL Struct THREAD_POOL_NODE Struct THREAD_WAITING_PROC Struct TRAJECTORY Struct TRAJECTORY_POINT Struct TREE Struct TREE_NODE Struct TS_LOG Struct WAYPOINT3D Struct WORKER_ARG Struct ZIP_SINK Struct _N_DC_ENTRY Struct _N_DC_GROUP_ENTRY Struct _N_GUI_COLORWHEEL Struct _N_GUI_COLORWHEEL_BLOCK Struct _N_GUI_COLORWHEEL_MOUSE Struct _N_GUI_CURVE Struct _N_GUI_CURVE_BLOCK Struct _N_GUI_CURVE_MOUSE Struct _N_GUI_GRID Struct _N_GUI_POPUP_ENTRY Struct _N_GUI_POPUP_LEVEL Struct _N_GUI_SB_SKIN Struct _N_GUI_TA_STEP Struct _N_GUI_THUMB Struct _N_GUI_WRAP_ACC Struct _compiled Struct _conn Struct _ip_slot Struct _mp_param Struct _n_civil Struct _seg Struct client Struct collector Struct date_vector Struct md_atom Struct md_cells Struct md_hit Struct md_line_ctx Struct mline Struct n_http_req_header Struct n_http_req_limits Struct n_http_request Struct n_markdown_block Struct n_markdown_doc Struct n_markdown_inline Struct n_markdown_span Struct n_reactor_stats Struct n_url_safe Struct n_url_safe_head Struct n_wrap_item Struct producer_state Struct rects Struct reply Struct runner Struct sink Struct tbuf Struct wrap_hit Struct wrap_span Structures Union COORD_VALUE Union HASH_DATA Union NODE_DATA_TYPES Union STACK_DATA dir_310dcdd4703e877a6b99d5dc3fc54d27 dir_68267d1309a1af8e8297ef4c3efbcdba dir_d28a4824dc47e487b107a5db32ef43c4 dir_d44c64559bbebec7f509842c48db8b23 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ex_gui_dropmenu_8c example ex_gui_frameless_drag_8c example ex_gui_global_scroll_8c example ex_gui_glyph_8c example ex_gui_grid_8c example ex_gui_hexview_8c example ex_gui_hover_8c example ex_gui_isometric_8c example ex_gui_kvtable_8c example ex_gui_label_fits_8c example ex_gui_label_lines_8c example ex_gui_layout_persist_8c example ex_gui_listbox_8c example ex_gui_md_8c example ex_gui_multiwin_8c example ex_gui_network_8c example ex_gui_particles_8c example ex_gui_placeholder_8c example ex_gui_popup_8c example ex_gui_progressbar_8c example ex_gui_reentrant_8c example ex_gui_round_8c example ex_gui_sectionlist_8c example ex_gui_slider_default_8c example ex_gui_slider_handle_8c example ex_gui_slider_step_8c example ex_gui_splitpane_8c example ex_gui_suggest_8c example ex_gui_syntaxview_8c example ex_gui_text_shorten_8c example ex_gui_textarea_selection_8c example ex_gui_tooltip_8c example ex_gui_tree_lazy_8c example ex_gui_tree_order_8c example ex_gui_tree_state_8c example ex_gui_window_rect_8c example ex_gui_zorder_8c example ex_hash_8c example ex_hex_8c example ex_html_8c example ex_http2_8c example ex_http2_server_8c example ex_http_cookie_8c example ex_http_form_8c example ex_http_mime_8c example ex_http_req_8c example ex_http_response_8c example ex_http_router_8c example ex_http_server_8c example ex_icc_8c example ex_iso_astar_8c example ex_json_8c example ex_kafka_8c example ex_linalg_8c example ex_list_8c example ex_log_8c example ex_markdown_8c example ex_module_8c example ex_monolith_8c example ex_network_8c example ex_network_8h example ex_network_accept_8c example ex_network_alpn_8c example ex_network_connect_abort_8c example ex_network_mock_8c example ex_network_proxy_8c example ex_network_reactor_8c example ex_network_sni_8c example ex_network_sse_8c example ex_network_ssl_8c example ex_network_ssl_hardened_8c example ex_network_ssl_hostname_8c example ex_network_ssl_nonblock_8c example ex_network_tls_defaults_8c example ex_network_ws_8c example ex_network_ws_limits_8c example ex_nstr_8c example ex_parallel_for_8c example ex_parallel_team_8c example ex_pcre_8c example ex_pretty_8c example ex_pth_8c example ex_query_8c example ex_random_8c example ex_sha256_8c example ex_signals_8c example ex_spawn_8c example ex_ssrf_8c example ex_stack_8c example ex_threads_8c example ex_tiff_8c example ex_time_formats_8c example ex_trajectory_8c example ex_trees_8c example ex_url_8c example ex_url_safe_8c example ex_wrap_8c example ex_x509_8c example ex_zip_8c example ex_zlib_8c example mainpage_8dox n__3d_8c n__3d_8h n__aabb_8c n__aabb_8h n__allegro5_8c n__allegro5_8h n__allegro__4_8c n__allegro__4_8h n__anim_8c n__anim_8h n__astar_8c n__astar_8h n__atlas_8c n__atlas_8h n__avro_8c n__avro_8h n__base64_8c n__base64_8h n__clipboard_8c n__clipboard_8h n__clock__sync_8c n__clock__sync_8h n__common_8c n__common_8h n__config__file_8c n__config__file_8h n__cookies_8c n__cookies_8h n__crypto_8c n__crypto_8h n__dead__reckoning_8c 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5 Module N_DIFF
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

DIFF: compare two texts line by line

Splits two texts into lines and produces the shortest edit script turning the first into the second, using Myers' greedy algorithm with a stored trace. More...

Structures

Name
struct N_DIFF_RESULT
edit script turning one text into another
struct N_DIFF_LINE
one line of an edit script

Functions

Name
N_STR * n_diff_to_unified(const N_DIFF_RESULT * result, size_t context)
Render an edit script as unified diff text.
void n_diff_result_free(N_DIFF_RESULT ** result)
Free an edit script and every line it holds.
N_DIFF_RESULT * n_diff_lines(const char * text_a, const char * text_b, size_t max_edits)
Compare two texts line by line.

Defines

Name
N_DIFF_NO_LINE
N_DIFF_LINE line_a / line_b value when the line has no counterpart there.
N_DIFF_MAX_EDITS_DEFAULT
n_diff_lines() default ceiling on the number of differing lines searched
N_DIFF_MAX_EDITS_CEILING
hard ceiling n_diff_lines() clamps max_edits to, keeping the worst case trace under about 64 MB
N_DIFF_INSERT
the line is only in the second text
N_DIFF_DELETE
the line is only in the first text
N_DIFF_CONTEXT_FULL
n_diff_to_unified() context asking for every common line, without hunk headers
N_DIFF_COMMON
the line is present in both texts

Detailed Description

Splits two texts into lines and produces the shortest edit script turning the first into the second, using Myers' greedy algorithm with a stored trace.

Unlike an index aligned comparison, inserting one line does not report every following line as changed.

Line splitting: texts are cut on '

'. A trailing newline closes the last line instead of opening an empty one, so "a\nb\n" and "a\nb" both yield two lines and compare equal. Carriage returns are kept, so a text that switched from LF to CRLF shows up as a difference rather than being silently normalised.

Cost control: the forward pass keeps one trace snapshot per edit, so memory grows with the square of the edit script length. n_diff_lines() therefore refuses to search past max_edits differing lines; when the two texts are further apart than that it falls back to reporting the whole differing region as deleted-then-inserted and sets N_DIFF_RESULT.truncated. The result is always a valid edit script, only a coarser one. Identical leading and trailing lines are matched before the search starts, so the limit applies to the part that actually differs.

Functions Documentation

function n_diff_to_unified

N_STR * n_diff_to_unified(
    const N_DIFF_RESULT * result,
    size_t context
)

Render an edit script as unified diff text.

Parameters:

  • result The edit script. Must not be NULL.
  • context Common lines kept around each change, or N_DIFF_CONTEXT_FULL.

Return: A new N_STR (free with free_nstr), or NULL on failure.

Each line is prefixed with ' ', '-' or '+'. With a finite context the output is cut into hunks introduced by a "@@ -a,b +c,d @@" header and common lines further than context away from a change are dropped; with N_DIFF_CONTEXT_FULL every line is emitted and no header is written.

function n_diff_result_free

void n_diff_result_free(
    N_DIFF_RESULT ** result
)

Free an edit script and every line it holds.

Parameters:

  • result Pointer to pointer, set to NULL on return.

function n_diff_lines

N_DIFF_RESULT * n_diff_lines(
    const char * text_a,
    const char * text_b,
    size_t max_edits
)

Compare two texts line by line.

Parameters:

  • text_a The first text. NULL is treated as empty.
  • text_b The second text. NULL is treated as empty.
  • max_edits Ceiling on the number of differing lines to search for, or 0 for N_DIFF_MAX_EDITS_DEFAULT, clamped to N_DIFF_MAX_EDITS_CEILING. Past it the differing region is reported coarsely and truncated is set.

Return: A new N_DIFF_RESULT the caller must release with n_diff_result_free(), or NULL on allocation failure. Two empty texts give an empty, valid result.

Macros Documentation

define N_DIFF_NO_LINE

#define N_DIFF_NO_LINE ((size_t)-1)

N_DIFF_LINE line_a / line_b value when the line has no counterpart there.

define N_DIFF_MAX_EDITS_DEFAULT

#define N_DIFF_MAX_EDITS_DEFAULT 1000

n_diff_lines() default ceiling on the number of differing lines searched

define N_DIFF_MAX_EDITS_CEILING

#define N_DIFF_MAX_EDITS_CEILING 4000

hard ceiling n_diff_lines() clamps max_edits to, keeping the worst case trace under about 64 MB

define N_DIFF_INSERT

#define N_DIFF_INSERT 2

the line is only in the second text

define N_DIFF_DELETE

#define N_DIFF_DELETE 1

the line is only in the first text

define N_DIFF_CONTEXT_FULL

#define N_DIFF_CONTEXT_FULL ((size_t)-1)

n_diff_to_unified() context asking for every common line, without hunk headers

define N_DIFF_COMMON

#define N_DIFF_COMMON 0

the line is present in both texts

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