tsync updated drw code from dmenu - dwm - [fork] customized build of dwm, the dynamic window manager
 (HTM) git clone git://src.adamsgaard.dk/dwm
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       ---
 (DIR) commit 646b351cc79845f4cc77415dfff474b9ae0053d9
 (DIR) parent e3b7e1d620e18818222c1e5033356ae29dd49e7f
 (HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
       Date:   Tue, 20 Oct 2015 23:34:49 +0200
       
       sync updated drw code from dmenu
       
       important:
       - drw_rect: didn't use w and h, change the dwm code accordingly.
       - drw_text: text is NULL is not allowed, use drw_rect().
       
       Diffstat:
         M drw.c                               |     251 +++++++++++++++----------------
         M drw.h                               |      34 ++++++++++++++++----------------
         M dwm.c                               |      10 ++++++----
         M util.c                              |      26 +++++++++++++++++++++-----
         M util.h                              |       1 +
       
       5 files changed, 164 insertions(+), 158 deletions(-)
       ---
 (DIR) diff --git a/drw.c b/drw.c
       t@@ -9,7 +9,7 @@
        #include "util.h"
        
        #define UTF_INVALID 0xFFFD
       -#define UTF_SIZ 4
       +#define UTF_SIZ     4
        
        static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
        static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
       t@@ -17,50 +17,55 @@ static const long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000
        static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
        
        static long
       -utf8decodebyte(const char c, size_t *i) {
       -        for(*i = 0; *i < (UTF_SIZ + 1); ++(*i))
       -                if(((unsigned char)c & utfmask[*i]) == utfbyte[*i])
       +utf8decodebyte(const char c, size_t *i)
       +{
       +        for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))
       +                if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])
                                return (unsigned char)c & ~utfmask[*i];
                return 0;
        }
        
        static size_t
       -utf8validate(long *u, size_t i) {
       -        if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
       +utf8validate(long *u, size_t i)
       +{
       +        if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
                        *u = UTF_INVALID;
       -        for(i = 1; *u > utfmax[i]; ++i)
       +        for (i = 1; *u > utfmax[i]; ++i)
                        ;
                return i;
        }
        
        static size_t
       -utf8decode(const char *c, long *u, size_t clen) {
       +utf8decode(const char *c, long *u, size_t clen)
       +{
                size_t i, j, len, type;
                long udecoded;
        
                *u = UTF_INVALID;
       -        if(!clen)
       +        if (!clen)
                        return 0;
                udecoded = utf8decodebyte(c[0], &len);
       -        if(!BETWEEN(len, 1, UTF_SIZ))
       +        if (!BETWEEN(len, 1, UTF_SIZ))
                        return 1;
       -        for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
       +        for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
                        udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
       -                if(type != 0)
       +                if (type)
                                return j;
                }
       -        if(j < len)
       +        if (j < len)
                        return 0;
                *u = udecoded;
                utf8validate(u, len);
       +
                return len;
        }
        
        Drw *
       -drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h) {
       -        Drw *drw = (Drw *)calloc(1, sizeof(Drw));
       -        if(!drw)
       -                return NULL;
       +drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
       +{
       +        Drw *drw;
       +
       +        drw = ecalloc(1, sizeof(Drw));
                drw->dpy = dpy;
                drw->screen = screen;
                drw->root = root;
       t@@ -70,26 +75,27 @@ drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h
                drw->gc = XCreateGC(dpy, root, 0, NULL);
                drw->fontcount = 0;
                XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
       +
                return drw;
        }
        
        void
       -drw_resize(Drw *drw, unsigned int w, unsigned int h) {
       -        if(!drw)
       -                return;
       +drw_resize(Drw *drw, unsigned int w, unsigned int h)
       +{
                drw->w = w;
                drw->h = h;
       -        if(drw->drawable != 0)
       +        if (drw->drawable)
                        XFreePixmap(drw->dpy, drw->drawable);
                drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
        }
        
        void
       -drw_free(Drw *drw) {
       +drw_free(Drw *drw)
       +{
                size_t i;
       -        for (i = 0; i < drw->fontcount; i++) {
       +
       +        for (i = 0; i < drw->fontcount; i++)
                        drw_font_free(drw->fonts[i]);
       -        }
                XFreePixmap(drw->dpy, drw->drawable);
                XFreeGC(drw->dpy, drw->gc);
                free(drw);
       t@@ -99,14 +105,11 @@ drw_free(Drw *drw) {
         * drw_font_create instead.
         */
        static Fnt *
       -drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern) {
       +drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern)
       +{
                Fnt *font;
       -
       -        if (!(fontname || fontpattern))
       -                die("No font specified.\n");
       -
       -        if (!(font = (Fnt *)calloc(1, sizeof(Fnt))))
       -                return NULL;
       +        XftFont *xfont = NULL;
       +        FcPattern *pattern = NULL;
        
                if (fontname) {
                        /* Using the pattern found at font->xfont->pattern does not yield same
       t@@ -115,46 +118,50 @@ drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern) {
                         * behaviour whereas the former just results in
                         * missing-character-rectangles being drawn, at least with some fonts.
                         */
       -                if (!(font->xfont = XftFontOpenName(drw->dpy, drw->screen, fontname)) ||
       -                    !(font->pattern = FcNameParse((FcChar8 *) fontname))) {
       -                        if (font->xfont) {
       -                                XftFontClose(drw->dpy, font->xfont);
       -                                font->xfont = NULL;
       -                        }
       +                if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
                                fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
       +                        return NULL;
       +                }
       +                if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
       +                        fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
       +                        XftFontClose(drw->dpy, xfont);
       +                        return NULL;
                        }
                } else if (fontpattern) {
       -                if (!(font->xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
       +                if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
                                fprintf(stderr, "error, cannot load font pattern.\n");
       -                } else {
       -                        font->pattern = NULL;
       +                        return NULL;
                        }
       +        } else {
       +                die("no font specified.\n");
                }
        
       -        if (!font->xfont) {
       -                free(font);
       -                return NULL;
       -        }
       -
       -        font->ascent = font->xfont->ascent;
       -        font->descent = font->xfont->descent;
       +        font = ecalloc(1, sizeof(Fnt));
       +        font->xfont = xfont;
       +        font->pattern = pattern;
       +        font->ascent = xfont->ascent;
       +        font->descent = xfont->descent;
                font->h = font->ascent + font->descent;
                font->dpy = drw->dpy;
       +
                return font;
        }
        
        Fnt*
       -drw_font_create(Drw *drw, const char *fontname) {
       +drw_font_create(Drw *drw, const char *fontname)
       +{
                return drw_font_xcreate(drw, fontname, NULL);
        }
        
        void
       -drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount) {
       +drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount)
       +{
                size_t i;
                Fnt *font;
       +
                for (i = 0; i < fontcount; i++) {
                        if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
       -                        die("Font cache exhausted.\n");
       +                        die("font cache exhausted.\n");
                        } else if ((font = drw_font_xcreate(drw, fonts[i], NULL))) {
                                drw->fonts[drw->fontcount++] = font;
                        }
       t@@ -162,68 +169,62 @@ drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount) {
        }
        
        void
       -drw_font_free(Fnt *font) {
       -        if(!font)
       +drw_font_free(Fnt *font)
       +{
       +        if (!font)
                        return;
       -        if(font->pattern)
       +        if (font->pattern)
                        FcPatternDestroy(font->pattern);
                XftFontClose(font->dpy, font->xfont);
                free(font);
        }
        
        Clr *
       -drw_clr_create(Drw *drw, const char *clrname) {
       +drw_clr_create(Drw *drw, const char *clrname)
       +{
                Clr *clr;
       -        Colormap cmap;
       -        Visual *vis;
       -
       -        if(!drw)
       -                return NULL;
       -        clr = (Clr *)calloc(1, sizeof(Clr));
       -        if(!clr)
       -                return NULL;
       -        cmap = DefaultColormap(drw->dpy, drw->screen);
       -        vis = DefaultVisual(drw->dpy, drw->screen);
       -        if(!XftColorAllocName(drw->dpy, vis, cmap, clrname, &clr->rgb))
       +
       +        clr = ecalloc(1, sizeof(Clr));
       +        if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
       +                               DefaultColormap(drw->dpy, drw->screen),
       +                               clrname, &clr->rgb))
                        die("error, cannot allocate color '%s'\n", clrname);
                clr->pix = clr->rgb.pixel;
       +
                return clr;
        }
        
        void
       -drw_clr_free(Clr *clr) {
       -        if(clr)
       -                free(clr);
       +drw_clr_free(Clr *clr)
       +{
       +        free(clr);
        }
        
        void
       -drw_setscheme(Drw *drw, ClrScheme *scheme) {
       -        if(drw && scheme)
       -                drw->scheme = scheme;
       +drw_setscheme(Drw *drw, ClrScheme *scheme)
       +{
       +        drw->scheme = scheme;
        }
        
        void
       -drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert) {
       -        int dx;
       -
       -        if(!drw || !drw->fontcount || !drw->scheme)
       +drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert)
       +{
       +        if (!drw->scheme)
                        return;
                XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->pix : drw->scheme->fg->pix);
       -        dx = (drw->fonts[0]->ascent + drw->fonts[0]->descent + 2) / 4;
       -        if(filled)
       -                XFillRectangle(drw->dpy, drw->drawable, drw->gc, x+1, y+1, dx+1, dx+1);
       -        else if(empty)
       -                XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x+1, y+1, dx, dx);
       +        if (filled)
       +                XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w + 1, h + 1);
       +        else if (empty)
       +                XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
        }
        
        int
       -drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert) {
       +drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert)
       +{
                char buf[1024];
                int tx, ty, th;
                Extnts tex;
       -        Colormap cmap;
       -        Visual *vis;
       -        XftDraw *d;
       +        XftDraw *d = NULL;
                Fnt *curfont, *nextfont;
                size_t i, len;
                int utf8strlen, utf8charlen, render;
       t@@ -235,23 +236,18 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *tex
                XftResult result;
                int charexists = 0;
        
       +        if (!drw->scheme || !drw->fontcount)
       +                return 0;
       +
                if (!(render = x || y || w || h)) {
                        w = ~w;
       -        }
       -
       -        if (!drw || !drw->scheme) {
       -                return 0;
       -        } else if (render) {
       -                XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->fg->pix : drw->scheme->bg->pix);
       +        } else {
       +                XSetForeground(drw->dpy, drw->gc, invert ?
       +                               drw->scheme->fg->pix : drw->scheme->bg->pix);
                        XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
       -        }
       -
       -        if (!text || !drw->fontcount) {
       -                return 0;
       -        } else if (render) {
       -                cmap = DefaultColormap(drw->dpy, drw->screen);
       -                vis = DefaultVisual(drw->dpy, drw->screen);
       -                d = XftDrawCreate(drw->dpy, drw->drawable, vis, cmap);
       +                d = XftDrawCreate(drw->dpy, drw->drawable,
       +                                  DefaultVisual(drw->dpy, drw->screen),
       +                                  DefaultColormap(drw->dpy, drw->screen));
                }
        
                curfont = drw->fonts[0];
       t@@ -274,24 +270,23 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *tex
                                        }
                                }
        
       -                        if (!charexists || (nextfont && nextfont != curfont)) {
       +                        if (!charexists || (nextfont && nextfont != curfont))
                                        break;
       -                        } else {
       +                        else
                                        charexists = 0;
       -                        }
                        }
        
                        if (utf8strlen) {
                                drw_font_getexts(curfont, utf8str, utf8strlen, &tex);
                                /* shorten text if necessary */
       -                        for(len = MIN(utf8strlen, (sizeof buf) - 1); len && (tex.w > w - drw->fonts[0]->h || w < drw->fonts[0]->h); len--)
       +                        for (len = MIN(utf8strlen, (sizeof buf) - 1); len && (tex.w > w - drw->fonts[0]->h || w < drw->fonts[0]->h); len--)
                                        drw_font_getexts(curfont, utf8str, len, &tex);
        
                                if (len) {
                                        memcpy(buf, utf8str, len);
                                        buf[len] = '\0';
       -                                if(len < utf8strlen)
       -                                        for(i = len; i && i > len - 3; buf[--i] = '.');
       +                                if (len < utf8strlen)
       +                                        for (i = len; i && i > len - 3; buf[--i] = '.');
        
                                        if (render) {
                                                th = curfont->ascent + curfont->descent;
       t@@ -299,7 +294,6 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *tex
                                                tx = x + (h / 2);
                                                XftDrawStringUtf8(d, invert ? &drw->scheme->bg->rgb : &drw->scheme->fg->rgb, curfont->xfont, tx, ty, (XftChar8 *)buf, len);
                                        }
       -
                                        x += tex.w;
                                        w -= tex.w;
                                }
       t@@ -316,18 +310,16 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *tex
                                 */
                                charexists = 1;
        
       -                        if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
       +                        if (drw->fontcount >= DRW_FONT_CACHE_SIZE)
                                        continue;
       -                        }
        
                                fccharset = FcCharSetCreate();
                                FcCharSetAddChar(fccharset, utf8codepoint);
        
                                if (!drw->fonts[0]->pattern) {
                                        /* Refer to the comment in drw_font_xcreate for more
       -                                 * information.
       -                                 */
       -                                die("The first font in the cache must be loaded from a font string.\n");
       +                                 * information. */
       +                                die("the first font in the cache must be loaded from a font string.\n");
                                }
        
                                fcpattern = FcPatternDuplicate(drw->fonts[0]->pattern);
       t@@ -346,65 +338,60 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *tex
                                        if (curfont && XftCharExists(drw->dpy, curfont->xfont, utf8codepoint)) {
                                                drw->fonts[drw->fontcount++] = curfont;
                                        } else {
       -                                        if (curfont) {
       -                                                drw_font_free(curfont);
       -                                        }
       +                                        drw_font_free(curfont);
                                                curfont = drw->fonts[0];
                                        }
                                }
                        }
                }
       -
       -        if (render) {
       +        if (d)
                        XftDrawDestroy(d);
       -        }
        
                return x;
        }
        
        void
       -drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) {
       -        if(!drw)
       -                return;
       +drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
       +{
                XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
                XSync(drw->dpy, False);
        }
        
       -
        void
       -drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *tex) {
       +drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *tex)
       +{
                XGlyphInfo ext;
        
       -        if(!font || !text)
       -                return;
                XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
                tex->h = font->h;
                tex->w = ext.xOff;
        }
        
        unsigned int
       -drw_font_getexts_width(Fnt *font, const char *text, unsigned int len) {
       +drw_font_getexts_width(Fnt *font, const char *text, unsigned int len)
       +{
                Extnts tex;
        
       -        if(!font)
       -                return -1;
                drw_font_getexts(font, text, len, &tex);
       +
                return tex.w;
        }
        
        Cur *
       -drw_cur_create(Drw *drw, int shape) {
       -        Cur *cur = (Cur *)calloc(1, sizeof(Cur));
       +drw_cur_create(Drw *drw, int shape)
       +{
       +        Cur *cur;
        
       -        if(!drw || !cur)
       -                return NULL;
       +        cur = ecalloc(1, sizeof(Cur));
                cur->cursor = XCreateFontCursor(drw->dpy, shape);
       +
                return cur;
        }
        
        void
       -drw_cur_free(Drw *drw, Cur *cursor) {
       -        if(!drw || !cursor)
       +drw_cur_free(Drw *drw, Cur *cursor)
       +{
       +        if (!cursor)
                        return;
                XFreeCursor(drw->dpy, cursor->cursor);
                free(cursor);
 (DIR) diff --git a/drw.h b/drw.h
       t@@ -43,32 +43,32 @@ typedef struct {
        } Extnts;
        
        /* Drawable abstraction */
       -Drw *drw_create(Display *dpy, int screen, Window win, unsigned int w, unsigned int h);
       -void drw_resize(Drw *drw, unsigned int w, unsigned int h);
       -void drw_free(Drw *drw);
       +Drw *drw_create(Display *, int, Window, unsigned int, unsigned int);
       +void drw_resize(Drw *, unsigned int, unsigned int);
       +void drw_free(Drw *);
        
        /* Fnt abstraction */
       -Fnt *drw_font_create(Drw *drw, const char *fontname);
       -void drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount);
       -void drw_font_free(Fnt *font);
       -void drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *extnts);
       -unsigned int drw_font_getexts_width(Fnt *font, const char *text, unsigned int len);
       +Fnt *drw_font_create(Drw *, const char *);
       +void drw_load_fonts(Drw *, const char *[], size_t);
       +void drw_font_free(Fnt *);
       +void drw_font_getexts(Fnt *, const char *, unsigned int, Extnts *);
       +unsigned int drw_font_getexts_width(Fnt *, const char *, unsigned int);
        
        /* Colour abstraction */
       -Clr *drw_clr_create(Drw *drw, const char *clrname);
       -void drw_clr_free(Clr *clr);
       +Clr *drw_clr_create(Drw *, const char *);
       +void drw_clr_free(Clr *);
        
        /* Cursor abstraction */
       -Cur *drw_cur_create(Drw *drw, int shape);
       -void drw_cur_free(Drw *drw, Cur *cursor);
       +Cur *drw_cur_create(Drw *, int);
       +void drw_cur_free(Drw *, Cur *);
        
        /* Drawing context manipulation */
       -void drw_setfont(Drw *drw, Fnt *font);
       -void drw_setscheme(Drw *drw, ClrScheme *scheme);
       +void drw_setfont(Drw *, Fnt *);
       +void drw_setscheme(Drw *, ClrScheme *);
        
        /* Drawing functions */
       -void drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert);
       -int drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert);
       +void drw_rect(Drw *, int, int, unsigned int, unsigned int, int, int, int);
       +int drw_text(Drw *, int, int, unsigned int, unsigned int, const char *, int);
        
        /* Map functions */
       -void drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h);
       +void drw_map(Drw *, Window, int, int, unsigned int, unsigned int);
 (DIR) diff --git a/dwm.c b/dwm.c
       t@@ -689,10 +689,12 @@ dirtomon(int dir) {
        
        void
        drawbar(Monitor *m) {
       -        int x, xx, w;
       +        int x, xx, w, dx;
                unsigned int i, occ = 0, urg = 0;
                Client *c;
        
       +        dx = (drw->fonts[0]->ascent + drw->fonts[0]->descent + 2) / 4;
       +
                for(c = m->clients; c; c = c->next) {
                        occ |= c->tags;
                        if(c->isurgent)
       t@@ -703,7 +705,7 @@ drawbar(Monitor *m) {
                        w = TEXTW(tags[i]);
                        drw_setscheme(drw, m->tagset[m->seltags] & 1 << i ? &scheme[SchemeSel] : &scheme[SchemeNorm]);
                        drw_text(drw, x, 0, w, bh, tags[i], urg & 1 << i);
       -                drw_rect(drw, x, 0, w, bh, m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
       +                drw_rect(drw, x + 1, 1, dx, dx, m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
                                   occ & 1 << i, urg & 1 << i);
                        x += w;
                }
       t@@ -728,11 +730,11 @@ drawbar(Monitor *m) {
                        if(m->sel) {
                                drw_setscheme(drw, m == selmon ? &scheme[SchemeSel] : &scheme[SchemeNorm]);
                                drw_text(drw, x, 0, w, bh, m->sel->name, 0);
       -                        drw_rect(drw, x, 0, w, bh, m->sel->isfixed, m->sel->isfloating, 0);
       +                        drw_rect(drw, x + 1, 1, dx, dx, m->sel->isfixed, m->sel->isfloating, 0);
                        }
                        else {
                                drw_setscheme(drw, &scheme[SchemeNorm]);
       -                        drw_text(drw, x, 0, w, bh, NULL, 0);
       +                        drw_rect(drw, x, 0, w, bh, 1, 0, 1);
                        }
                }
                drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 (DIR) diff --git a/util.c b/util.c
       t@@ -2,16 +2,32 @@
        #include <stdarg.h>
        #include <stdio.h>
        #include <stdlib.h>
       +#include <string.h>
        
        #include "util.h"
        
       +void *
       +ecalloc(size_t nmemb, size_t size)
       +{
       +        void *p;
       +
       +        if (!(p = calloc(nmemb, size)))
       +                perror(NULL);
       +        return p;
       +}
       +
        void
       -die(const char *errstr, ...) {
       +die(const char *fmt, ...) {
                va_list ap;
        
       -        va_start(ap, errstr);
       -        vfprintf(stderr, errstr, ap);
       +        va_start(ap, fmt);
       +        vfprintf(stderr, fmt, ap);
                va_end(ap);
       -        exit(EXIT_FAILURE);
       -}
        
       +        if (fmt[0] && fmt[strlen(fmt)-1] == ':') {
       +                fputc(' ', stderr);
       +                perror(NULL);
       +        }
       +
       +        exit(1);
       +}
 (DIR) diff --git a/util.h b/util.h
       t@@ -5,3 +5,4 @@
        #define BETWEEN(X, A, B)        ((A) <= (X) && (X) <= (B))
        
        void die(const char *errstr, ...);
       +void *ecalloc(size_t, size_t);