From: Christian Heller Date: Fri, 23 Aug 2013 02:35:33 +0000 (+0200) Subject: Added memory allocation error checks to windows library. X-Git-Tag: tce~1069 X-Git-Url: https://plomlompom.com/repos/%7B%7B%20web_path%20%7D%7D/decks/%7B%7Bprefix%7D%7D/%7B%7Bprefix%7D%7D/index.html?a=commitdiff_plain;h=bed76e36029b889501cf45e6852830fbfa35ea11;p=plomrogue Added memory allocation error checks to windows library. --- diff --git a/src/main.c b/src/main.c index eddf4bf..5cc1ecb 100644 --- a/src/main.c +++ b/src/main.c @@ -170,7 +170,8 @@ int main(int argc, char *argv[]) raw(); init_keybindings(&world); set_cleanup_flag(CLEANUP_KEYBINDINGS); - struct WinMeta win_meta = init_win_meta(screen); + struct WinMeta win_meta; + init_win_meta(screen, &win_meta); struct Win win_keys = init_win(&win_meta, "Keys", 0, 29, &world, draw_keys_win); struct Win win_info = init_win(&win_meta, "Info", diff --git a/src/windows.c b/src/windows.c index 9e9fd12..8af2ba2 100644 --- a/src/windows.c +++ b/src/windows.c @@ -1,7 +1,7 @@ /* windows.c */ #include "windows.h" -#include /* for uint16_t, uint32_t */ +#include /* for uint8_t, uint16_t, uint32_t */ #include /* for typedefs WINDOW, chtype, wresize(), getmaxx(), */ /* getmaxy(), supbad(), delwin(), mvwaddch(), */ /* mvwaddstr(), newpad(), wnoutrefres(), erase(), */ @@ -13,16 +13,18 @@ /* Fit virtual screen's width to minimum width demanded by current windows' - * geometries. + * geometries. Returns 0 on success, 1 on (pad memory allocation) error. */ -static void refit_pad(struct WinMeta * wmeta); +static uint8_t refit_pad(struct WinMeta * wmeta); /* Update geometry (sizes, positions) of window "w" and its successors in the * window chain. For the positioning algorithm place_win() is used. + * + * update_wins() returns 0 on success, 1 on (pad/window memory alloc.) error. */ -static void update_wins(struct WinMeta * wmeta, struct Win * w); +static uint8_t update_wins(struct WinMeta * wmeta, struct Win * w); static void place_win(struct WinMeta * wmeta, struct Win * w); @@ -56,7 +58,7 @@ static void draw_wins_bordercorners(struct Win * w, WINDOW * pad); -static void refit_pad(struct WinMeta * wmeta) +static uint8_t refit_pad(struct WinMeta * wmeta) { /* Determine rightmost window column. */ uint16_t lastwincol = 0; @@ -73,28 +75,39 @@ static void refit_pad(struct WinMeta * wmeta) /* Only resize the pad if the rightmost window column has changed. */ if (getmaxx(wmeta->padframe.curses_win) != lastwincol) { - wresize(wmeta->padframe.curses_win, - getmaxy(wmeta->padframe.curses_win), lastwincol + 2); + return (ERR == wresize(wmeta->padframe.curses_win, + getmaxy(wmeta->padframe.curses_win), + lastwincol + 2)); } + return 0; } -static void update_wins(struct WinMeta * wmeta, struct Win * w) +static uint8_t update_wins(struct WinMeta * wmeta, struct Win * w) { if (0 != w->frame.curses_win) { destroy_win(w); } place_win(wmeta, w); - refit_pad(wmeta); - w->frame.curses_win = subpad(wmeta->padframe.curses_win, - w->frame.size.y, w->frame.size.x, - w->start.y, w->start.x); + if (0 != refit_pad(wmeta)) + { + return 1; + } + WINDOW * test = subpad(wmeta->padframe.curses_win, + w->frame.size.y, w->frame.size.x, + w->start.y, w->start.x); + if (NULL == test) + { + return 1; + } + w->frame.curses_win = test; if (0 != w->next) { - update_wins(wmeta, w->next); + return update_wins(wmeta, w->next); } + return 0; } @@ -165,7 +178,7 @@ static void place_win(struct WinMeta * wmeta, struct Win * w) -static void destroy_win (struct Win * w) +static void destroy_win(struct Win * w) { delwin(w->frame.curses_win); w->frame.curses_win = 0; @@ -173,7 +186,7 @@ static void destroy_win (struct Win * w) -static void draw_wins (struct Win * w) +static void draw_wins(struct Win * w) { w->draw(w); if (0 != w->next) @@ -256,18 +269,23 @@ static void draw_wins_bordercorners(struct Win * w, WINDOW * pad) -extern struct WinMeta init_win_meta(WINDOW * screen) +extern uint8_t init_win_meta(WINDOW * screen, struct WinMeta * wmeta) { - struct WinMeta wmeta; - wmeta.screen = screen; - wmeta.padframe.size.y = getmaxy(screen); - wmeta.padframe.size.x = getmaxx(screen); - wmeta.chain_start = 0; - wmeta.chain_end = 0; - wmeta.pad_offset = 0; - wmeta.padframe.curses_win = newpad(wmeta.padframe.size.y, 1); - wmeta.active = 0; - return wmeta; + wmeta->screen = screen; + wmeta->padframe.size.y = getmaxy(screen); + wmeta->padframe.size.x = getmaxx(screen); + wmeta->chain_start = 0; + wmeta->chain_end = 0; + wmeta->pad_offset = 0; + WINDOW * test; + test = newpad(wmeta->padframe.size.y, 1); + if (NULL == test) + { + return 1; + } + wmeta->padframe.curses_win = test; + wmeta->active = 0; + return 0; } @@ -304,7 +322,7 @@ extern struct Win init_win(struct WinMeta * wmeta, char * title, -extern void append_win(struct WinMeta * wmeta, struct Win * w) +extern uint8_t append_win(struct WinMeta * wmeta, struct Win * w) { if (0 != wmeta->chain_start) { @@ -317,12 +335,12 @@ extern void append_win(struct WinMeta * wmeta, struct Win * w) wmeta->chain_start = w; } wmeta->chain_end = w; - update_wins(wmeta, w); + return update_wins(wmeta, w); } -extern void suspend_win(struct WinMeta * wmeta, struct Win * w) +extern uint8_t suspend_win(struct WinMeta * wmeta, struct Win * w) { destroy_win(w); @@ -342,10 +360,13 @@ extern void suspend_win(struct WinMeta * wmeta, struct Win * w) { wmeta->active = w->next; } - update_wins(wmeta, w->next); /* Positioning of successor windows may */ - pad_refitted = 1; /* be affected / need correction. Note */ - } /* that update_wins() already refits the */ - else /* pad, voiding later need for that. */ + if (0 != update_wins(wmeta, w->next)) /* Positioning of successor */ + { /* windows may be affected / */ + return 1; /* need correction. */ + } /* Note that update_wins() */ + pad_refitted = 1; /* already refits the pad, */ + } /* voiding later need for that. */ + else { wmeta->chain_end = w->prev; if (wmeta->active == w) @@ -359,8 +380,9 @@ extern void suspend_win(struct WinMeta * wmeta, struct Win * w) if (0 == pad_refitted) { - refit_pad(wmeta); + return refit_pad(wmeta); } + return 0; } @@ -378,17 +400,18 @@ extern void reset_pad_offset(struct WinMeta * wmeta, uint16_t new_offset) -extern void resize_active_win(struct WinMeta * wmeta, struct yx_uint16 size) +extern uint8_t resize_active_win(struct WinMeta * wmeta, struct yx_uint16 size) { if (0 != wmeta->active && size.x > 0 && size.y > 0 && size.y < wmeta->padframe.size.y) { wmeta->active->frame.size = size; - update_wins(wmeta, wmeta->chain_start); /* Positioning of successor */ - } /* windows may be affected. */ -} - + return update_wins(wmeta, wmeta->chain_start); /* Succeeding windows' */ + } /* positioning may be */ + return 0; /* affected. */ +} /* TODO: Why start at */ + /* chain_start then? */ extern void cycle_active_win(struct WinMeta * wmeta, char dir) @@ -422,7 +445,7 @@ extern void cycle_active_win(struct WinMeta * wmeta, char dir) -extern void shift_active_win(struct WinMeta * wmeta, char dir) +extern uint8_t shift_active_win(struct WinMeta * wmeta, char dir) { if (0 != wmeta->active /* No shifting with less */ && wmeta->chain_start != wmeta->chain_end /* than one window visible. */ @@ -447,6 +470,10 @@ extern void shift_active_win(struct WinMeta * wmeta, char dir) i_max++; } struct Win ** wins = malloc(i_max * sizeof(struct Win *)); + if (NULL == wins) + { + return 1; + } for (i = 0, w_p = wmeta->chain_start; i < i_max; i++) @@ -462,19 +489,31 @@ extern void shift_active_win(struct WinMeta * wmeta, char dir) { if (dir == 'f') { - append_win(wmeta, w_shift); + if (0 != append_win(wmeta, w_shift)) + { + return 1; + } for (i = 0; i < i_max - 1; i++) { - append_win(wmeta, wins[i]); + if (0 != append_win(wmeta, wins[i])) + { + return 1; + } } } else { for (i = 1; i < i_max; i++) { - append_win(wmeta, wins[i]); + if (0 != append_win(wmeta, wins[i])) + { + return 1; + } + } + if (0 != append_win(wmeta, w_shift)) + { + return 1; } - append_win(wmeta, w_shift); } } else @@ -484,13 +523,19 @@ extern void shift_active_win(struct WinMeta * wmeta, char dir) if ( (dir == 'f' && w_shift == wins[i]) || (dir == 'b' && w_shift == wins[i+1])) { - append_win(wmeta, wins[i+1]); - append_win(wmeta, wins[i]); + if ( 0 != append_win(wmeta, wins[i+1]) + || 0 != append_win(wmeta, wins[i])) + { + return 1; + } i++; } else { - append_win(wmeta, wins[i]); + if (0 != append_win(wmeta, wins[i])) + { + return 1; + } } } } @@ -498,6 +543,7 @@ extern void shift_active_win(struct WinMeta * wmeta, char dir) wmeta->active = w_shift; /* Otherwise lastly appended win is active. */ } + return 0; } @@ -545,8 +591,8 @@ extern void draw_all_wins(struct WinMeta * wmeta) -extern void draw_scroll_hint(struct Frame * frame, uint16_t pos, uint32_t dist, - char dir) +extern uint8_t draw_scroll_hint(struct Frame * frame, uint16_t pos, + uint32_t dist, char dir) { /* Decide on alignment (vertical/horizontal?), thereby scroll hint text. */ char * more = "more"; @@ -561,6 +607,10 @@ extern void draw_scroll_hint(struct Frame * frame, uint16_t pos, uint32_t dist, } char * scrolldsc = malloc((4 * sizeof(char)) + strlen(more) + strlen(unit) + 10); /* 10 = uint32 max strlen */ + if (NULL == scrolldsc) + { + return 1; + } sprintf(scrolldsc, " %d %s %s ", dist, more, unit); /* Decide on offset of the description text inside the scroll hint line. */ @@ -593,4 +643,5 @@ extern void draw_scroll_hint(struct Frame * frame, uint16_t pos, uint32_t dist, } free(scrolldsc); + return 0; } diff --git a/src/windows.h b/src/windows.h index 2823996..9414dd5 100644 --- a/src/windows.h +++ b/src/windows.h @@ -79,12 +79,14 @@ struct WinMeta -/* Create on the terminal "screen" an empty WinMeta. Note that emptiness is - * marked by WinMeta.chain_start=0. Other struct values are also initialized 0, - * except for the virtual screen (terminal screen height, width = 1) and its - * terminal-sized frame. +/* Initialize empty WinMeta "wmeta" on the terminal "screen". Note that + * emptiness is marked by WinMeta.chain_start=0. Other struct values are also + * initialized 0, except for the virtual screen (terminal screen height, width = + * 1) and its terminal-sized frame. + * + * Returns 0 on success, 1 on (ncurses newpad() memory allocation) error. */ -extern struct WinMeta init_win_meta(WINDOW * screen); +extern uint8_t init_win_meta(WINDOW * screen, struct WinMeta * wmeta); @@ -110,9 +112,11 @@ extern struct Win init_win(struct WinMeta * wmeta, char * title, * Appended windows will become active. Suspended active windows will move the * active window selection to their successor in the window chain or, failing * that, their predecessor; if no window remains, none will be active. + * + * Return 0 on success, and 1 on (ncurses window/pad memory allocation) error. */ -extern void append_win(struct WinMeta * wmeta, struct Win * w); -extern void suspend_win(struct WinMeta * wmeta, struct Win * w); +extern uint8_t append_win(struct WinMeta * wmeta, struct Win * w); +extern uint8_t suspend_win(struct WinMeta * wmeta, struct Win * w); @@ -129,8 +133,10 @@ extern void reset_pad_offset(struct WinMeta * wmeta, uint16_t new_offset); /* Apply new size "size" to the active window, but only if it provides for at * least one cell width/height and is in height at least one cell smaller than * the screen's vertical height (to provide space for the title bar). + * + * Returns 0 on success, 1 on (ncurses window/pad memory allocation) error. */ -extern void resize_active_win(struct WinMeta * wmeta, struct yx_uint16 size); +extern uint8_t resize_active_win(struct WinMeta * wmeta, struct yx_uint16 size); @@ -143,8 +149,10 @@ extern void cycle_active_win(struct WinMeta * wmeta, char dir); /* Move active window forwards (set dir="f") or backwards (set dir="b"). Wrap * around in the window chain if start / end of it is met. + * + * Return 0 on success, and 1 on (ncurses window/pad memory allocation) error. */ -extern void shift_active_win(struct WinMeta * wmeta, char dir); +extern uint8_t shift_active_win(struct WinMeta * wmeta, char dir); @@ -162,9 +170,11 @@ extern void draw_all_wins(struct WinMeta * wmeta); * a column or a row dependent on "dir" being *either* "<"/">" *or* something * else). It will consist of a line of "dir" symbols bracketing a descriptive * text stating the number of rows/columns further available beyond the hint. + * + * Return 0 on success, and 1 on error (of scroll hint text memory allocation). */ -extern void draw_scroll_hint(struct Frame * frame, uint16_t pos, uint32_t dist, - char dir); +extern uint8_t draw_scroll_hint(struct Frame * frame, uint16_t pos, + uint32_t dist, char dir);