diff options
| -rw-r--r-- | doc/if.html | 17 | ||||
| -rw-r--r-- | src/execline/if.c | 13 |
2 files changed, 17 insertions, 13 deletions
diff --git a/doc/if.html b/doc/if.html index 700ee59..99be53e 100644 --- a/doc/if.html +++ b/doc/if.html @@ -38,19 +38,22 @@ then waits for it to complete. </li> <li> If <em>prog1</em> crashes, <tt>if</tt> prints an error message then exits 128 plus the number of the signal that killed <em>prog1</em>. </li> - <li> If <em>prog1</em> exits a non-zero status, -<tt>if</tt> exits 1.</li> + <li> If <em>prog1</em> exits with a non-zero code, <tt>if</tt> exits with an +<a href="exitcodes.html">approximation</a> of that code. </li> <li> Else <tt>if</tt> execs into <em>prog2</em>. </li> </ul> <h2> Options </h2> <ul> - <li> <tt>-X</tt> : treat a crash of <em>prog1</em> as a non-zero ("false") exit. - <li> <tt>-n</tt> : negate the test (exit on true, exec into <em>prog2</em> on false) </li> - <li> <tt>-x</tt> <em>exitcode</em> : exit <em>exitcode</em> instead of 1 if the test fails. </li> - <li> <tt>-t</tt> : exit 0 instead of 1 if the test fails. -This is equivalent to <tt>-x 0</tt>. </li> + <li> <tt>-X</tt> : treat a crash of <em>prog1</em> as a non-zero ("false") exit. This +is mostly useful in combination with <tt>-n</tt>. </li> + <li> <tt>-n</tt> : negate the test. If <em>prog1</em> exits true, then <tt>if</tt> will +exit 1; else it will exec into <em>prog2</em>. </li> + <li> <tt>-x</tt> <em>exitcode</em> : if <tt>if</tt> needs to exit, it will exit <em>exitcode</em> +instead of whatever else it would have exited. </li> + <li> <tt>-t</tt> : if <tt>if</tt> needs to exit, it will exit 0. This is equivalent +to <tt>-x 0</tt>. </li> </ul> <h2> Notes </h2> diff --git a/src/execline/if.c b/src/execline/if.c index a37ecbc..8820dfa 100644 --- a/src/execline/if.c +++ b/src/execline/if.c @@ -11,12 +11,13 @@ #include <execline/execline.h> #define USAGE "if [ -n ] [ -X ] [ -t | -x exitcode ] { command... }" +#define dieusage() strerr_dieusage(100, USAGE) ; int main (int argc, char const **argv, char const *const *envp) { int argc1, wstat ; pid_t pid ; - int not = 0, flagnormalcrash = 0 ; + int not = 0, fixed = 0, flagnormalcrash = 0 ; unsigned short e = 1 ; PROG = "if" ; { @@ -27,11 +28,11 @@ int main (int argc, char const **argv, char const *const *envp) if (opt == -1) break ; switch (opt) { - case 'n' : not = 1 ; break ; + case 'n' : not = 1 ; fixed = 1 ; break ; case 'X' : flagnormalcrash = 1 ; break ; - case 't' : e = 0 ; break ; - case 'x' : if (ushort_scan(l.arg, &e)) break ; - default : strerr_dieusage(100, USAGE) ; + case 't' : e = 0 ; fixed = 1 ; break ; + case 'x' : if (!ushort_scan(l.arg, &e)) dieusage() ; fixed = 1 ; break ; + default : dieusage() ; } } argc -= l.ind ; argv += l.ind ; @@ -49,6 +50,6 @@ int main (int argc, char const **argv, char const *const *envp) fmt[uint_fmt(fmt, WTERMSIG(wstat))] = 0 ; strerr_dief2x(128 + WTERMSIG(wstat), "child crashed with signal ", fmt) ; } - if (not == !wait_estatus(wstat)) return e ; + if (not == !wait_estatus(wstat)) return fixed ? e : wait_estatus(wstat) ; xexec0_e(argv+argc1+1, envp) ; } |