diff options
| -rw-r--r-- | lastlog.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/lastlog.c b/lastlog.c index 9036527..0cb6e84 100644 --- a/lastlog.c +++ b/lastlog.c @@ -63,6 +63,42 @@ static struct stat statbuf; /* fstat buffer for file size */ // TODO just put that in a variable... #define NOW (time ((time_t *) 0)) +/* https://gist.github.com/ciembor/1494530 + * under the "do what you want :)" license */ +float hue2rgb(float p, float q, float t) { + if (t < 0) + t += 1; + if (t > 1) + t -= 1; + if (t < 1./6) + return p + (q - p) * 6 * t; + if (t < 1./2) + return q; + if (t < 2./3) + return p + (q - p) * (2./3 - t) * 6; + return p; +} +int byteclamp(int n) { + if (n < 0) return 0; + if (n > 0xFF) return 0xFF; + return n; +} +int hsl2rgb(float h, float s, float l) { + float r, g, b; + + if (0 == s) { + r = g = b = l; // achromatic + } else { + float q = l < 0.5 ? l * (1 + s) : l + s - l * s; + float p = 2 * l - q; + r = hue2rgb(p, q, h + 1./3) * 255; + g = hue2rgb(p, q, h) * 255; + b = hue2rgb(p, q, h - 1./3) * 255; + } + + return (byteclamp(r) << 16) + (byteclamp(g) << 8) + byteclamp(b); +} + static void print_one(const struct passwd *pw) { char *cp; @@ -76,6 +112,10 @@ static void print_one(const struct passwd *pw) return; } + if (pw->pw_uid < 1000 || pw->pw_uid == 65534) { + return; + } + offset = (off_t) pw->pw_uid * sizeof(ll); if (offset + sizeof(ll) <= statbuf.st_size) { /* fseeko errors are not really relevant for us. */ @@ -114,7 +154,7 @@ static void print_one(const struct passwd *pw) float b = 2.5; f = MAX(f * f / b, f * a - a + 1.0); float hue = f * 90.0 + 260.; - printf("<a href=\"/~%s\" title=\"%s\" style=\"background: hsl(%fdeg %f%% %f%%)\"></a>\n", pw->pw_name, pw->pw_name, hue, 20. + f*70., 10. + f*90.); + printf("<a href=\"/~%s\" style=\"background: #%06x\"></a>\n", pw->pw_name, hsl2rgb(hue / 360., .2 + f*.7, .1 + f*.9)); } int main(void) |