174 lines
5.6 KiB
Diff
174 lines
5.6 KiB
Diff
Description: Use environment to set user and from/host column widths
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Author: Craig Small <csmall@debian.org>
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Bug-Debian: http://bugs.debian.org/396423
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Bug-Debian: http://bugs.debian.org/341439
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Index: b/w.1
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===================================================================
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--- a/w.1 2009-11-24 21:00:42.000000000 +1100
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+++ b/w.1 2009-11-24 21:00:44.000000000 +1100
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@@ -1,6 +1,6 @@
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.\" -*-Nroff-*-
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.\"
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-.TH W 1 "8 Dec 1993 " " " "Linux User's Manual"
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+.TH W 1 "5 October 2009 " " " "Linux User's Manual"
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.SH NAME
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w \- Show who is logged on and what they are doing.
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.SH SYNOPSIS
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@@ -61,6 +61,14 @@
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.B "user "
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Show information about the specified user only.
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+.SH ENVIRONMENT
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+.TP
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+PROCPS_USERLEN
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+Override the default width of the username column. Defaults to 8.
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+.TP
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+PROCPS_FROMLEN
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+Override the default width of the from column. Defaults to 16.
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+
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.SH FILES
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.TP
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.I /var/run/utmp
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Index: b/w.c
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===================================================================
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--- a/w.c 2009-11-24 21:00:43.000000000 +1100
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+++ b/w.c 2009-11-24 21:00:44.000000000 +1100
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@@ -44,20 +44,19 @@
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/* Uh... same thing as UT_NAMESIZE */
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#define USERSZ (sizeof u->ut_user)
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+/* Arbitary setting, not too big for the screen, max host size */
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+#define HOSTSZ 40
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+
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/* This routine is careful since some programs leave utmp strings
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- * unprintable. Always outputs at least 16 chars padded with spaces
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+ * unprintable. Always outputs at least fromlen chars padded with spaces
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* on the right if necessary.
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*/
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-static void print_host(const char *restrict host, int len) {
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+static void print_host(const char *restrict host, int len, const int fromlen) {
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const char *last;
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int width = 0;
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- /* FIXME: there should really be a way to configure this... */
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- /* for now, we'll just limit it to the 16 that the libc5 version
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- * of utmp uses.
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- */
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- if (len > 16) len = 16;
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+ if (len > fromlen) len = fromlen;
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last = host + len;
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for ( ; host < last ; host++){
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if (isprint(*host) && *host != ' ') {
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@@ -68,7 +67,8 @@
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}
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}
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// space-fill, and a '-' too if needed to ensure the column exists
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- if(width < 16) fputs("- "+width, stdout);
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+ while(width++ < fromlen)
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+ fputc(' ',stdout);
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}
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/***** compact 7 char format for time intervals (belongs in libproc?) */
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@@ -180,7 +180,7 @@
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/***** showinfo */
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-static void showinfo(utmp_t *u, int formtype, int maxcmd, int from) {
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+static void showinfo(utmp_t *u, int formtype, int maxcmd, int from, const int userlen, const int fromlen) {
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unsigned long long jcpu;
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int ut_pid_found;
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unsigned i;
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@@ -205,9 +205,9 @@
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strncpy(uname, u->ut_user, USERSZ); /* force NUL term for printf */
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if (formtype) {
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- printf("%-9.8s%-9.8s", uname, u->ut_line);
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+ printf("%-*.*s%-9.8s", userlen+1, userlen, uname, u->ut_line);
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if (from)
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- print_host(u->ut_host, sizeof u->ut_host);
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+ print_host(u->ut_host, sizeof u->ut_host, fromlen);
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print_logintime(u->ut_time, stdout);
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if (*u->ut_line == ':') /* idle unknown for xdm logins */
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printf(" ?xdm? ");
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@@ -220,9 +220,9 @@
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} else
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printf(" ? ");
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} else {
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- printf("%-9.8s%-9.8s", u->ut_user, u->ut_line);
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+ printf("%-*.*s%-9.8s", userlen+1, userlen, u->ut_user, u->ut_line);
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if (from)
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- print_host(u->ut_host, sizeof u->ut_host);
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+ print_host(u->ut_host, sizeof u->ut_host, fromlen);
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if (*u->ut_line == ':') /* idle unknown for xdm logins */
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printf(" ?xdm? ");
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else
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@@ -245,6 +245,9 @@
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utmp_t *u;
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struct winsize win;
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int header=1, longform=1, from=1, args, maxcmd, ch;
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+ int userlen = 8;
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+ int fromlen = 16;
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+ char *env_var;
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#ifndef W_SHOWFROM
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from = 0;
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@@ -275,6 +278,22 @@
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if ((argv[optind]))
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user = (argv[optind]);
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+ /* Get user field length from environment */
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+ if ( (env_var = getenv("PROCPS_USERLEN")) != NULL) {
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+ userlen = atoi(env_var);
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+ if (userlen < 8 || userlen > USERSZ) {
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+ fprintf(stderr, "User length environment PROCPS_USERLEN must be between 8 and %d, ignoring.\n", USERSZ);
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+ userlen=8;
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+ }
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+ }
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+ /* Get from field length from environment */
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+ if ( (env_var = getenv("PROCPS_FROMLEN")) != NULL) {
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+ fromlen = atoi(env_var);
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+ if (fromlen < 8 || fromlen > HOSTSZ) {
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+ fprintf(stderr, "From length environment PROCPS_FROMLEN must be between 8 and %d, ignoring.\n", HOSTSZ);
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+ fromlen=16;
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+ }
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+ }
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if (ioctl(1, TIOCGWINSZ, &win) != -1 && win.ws_col > 0)
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maxcmd = win.ws_col;
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else if (p = getenv("COLUMNS"))
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@@ -285,7 +304,7 @@
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fprintf(stderr, "%d column window is too narrow\n", maxcmd);
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exit(1);
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}
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- maxcmd -= 29 + (from ? 16 : 0) + (longform ? 20 : 0);
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+ maxcmd -= 21 + userlen + (from ? fromlen : 0) + (longform ? 20 : 0);
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if (maxcmd < 3)
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fprintf(stderr, "warning: screen width %d suboptimal.\n", win.ws_col);
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@@ -293,7 +312,7 @@
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if (header) { /* print uptime and headers */
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print_uptime();
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- printf("USER TTY ");
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+ printf("%-*s TTY ",userlen,"USER");
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if (from)
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printf("FROM ");
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if (longform)
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@@ -309,14 +328,14 @@
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u = getutent();
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if (unlikely(!u)) break;
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if (u->ut_type != USER_PROCESS) continue;
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- if (!strncmp(u->ut_user, user, USERSZ)) showinfo(u, longform, maxcmd, from);
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+ if (!strncmp(u->ut_user, user, USERSZ)) showinfo(u, longform, maxcmd, from, userlen, fromlen);
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}
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} else {
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for (;;) {
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u = getutent();
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if (unlikely(!u)) break;
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if (u->ut_type != USER_PROCESS) continue;
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- if (*u->ut_user) showinfo(u, longform, maxcmd, from);
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+ if (*u->ut_user) showinfo(u, longform, maxcmd, from, userlen, fromlen);
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}
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}
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endutent();
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