diff --git a/utils/help.cpp b/utils/help.cpp
index 548617c4..7af880d2 100644
--- a/utils/help.cpp
+++ b/utils/help.cpp
@@ -1,6 +1,6 @@
/*******************************************************************************
- Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
+ Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
@@ -16,23 +16,101 @@
this program. If not, see .
help.cpp
- Prints a friendly message and ls /bin.
+ Prints a friendly message and print the names of everything in PATH.
*******************************************************************************/
-#include
+#include
+#include
+
+#include
#include
#include
+#include
+#include
+#include
#include
int main(int /*argc*/, char* /*argv*/[])
{
printf("Please enter the name of one of the following programs:\n");
- const char* programname = "ls";
- const char* newargv[] = { programname, "/bin", NULL };
- execvp(programname, (char* const*) newargv);
- error(1, errno, "%s", programname);
+ const char* path = getenv("PATH");
+ if ( !path )
+ return 0;
- return 1;
+ pid_t child_pid = -1;
+
+ if ( isatty(1) )
+ {
+ int pipe_fds[2];
+ if ( pipe(pipe_fds) )
+ error(1, errno, "pipe");
+
+ if ( (child_pid = fork()) < 0 )
+ error(1, errno, "fork");
+
+ if ( !child_pid )
+ {
+ dup2(pipe_fds[0], 0);
+ close(pipe_fds[0]);
+ close(pipe_fds[1]);
+ execlp("column", "column", NULL);
+ execlp("cat", "cat", NULL);
+ int ic;
+ while ( (ic = fgetc(stdin)) != EOF )
+ fputc(ic, stdout);
+ exit(0);
+ }
+
+ dup2(pipe_fds[1], 1);
+ close(pipe_fds[0]);
+ close(pipe_fds[1]);
+ }
+
+ char* dirname = NULL;
+ while ( *path )
+ {
+ if ( dirname ) { free(dirname); dirname = NULL; }
+ size_t len = strcspn(path, ":");
+ if ( !len ) { path++; continue; }
+ dirname = (char*) malloc((len+1) * sizeof(char));
+ if ( !dirname )
+ error(1, errno, "malloc");
+ memcpy(dirname, path, len * sizeof(char));
+ dirname[len] = '\0';
+ path += len + 1;
+ DIR* dir = opendir(dirname);
+ if ( !dir )
+ continue;
+ while ( struct dirent* entry = readdir(dir) )
+ {
+ if ( entry->d_name[0] == '.' )
+ continue;
+ struct stat st;
+ if ( fstatat(dirfd(dir), entry->d_name, &st, 0) )
+ continue;
+ if ( !S_ISREG(st.st_mode) )
+ continue;
+ if ( !(st.st_mode & 0111) )
+ continue;
+ printf("%s\n", entry->d_name);
+ }
+ closedir(dir);
+ }
+ free(dirname);
+
+ if ( 0 <= child_pid )
+ {
+ fflush(stdout);
+ close(1);
+ int exit_status;
+ waitpid(child_pid, &exit_status, 0);
+ if ( WIFSIGNALED(exit_status) )
+ exit(128 + WTERMSIG(exit_status));
+ if ( WIFEXITED(exit_status) && WEXITSTATUS(exit_status) )
+ exit(WEXITSTATUS(exit_status));
+ }
+
+ return 0;
}