mpw-tools/Help.c
Kelvin Sherlock fdb87e2580 add license
2013-07-30 01:06:41 -04:00

1 line
3.1 KiB
C

/*
* Copyright (c) 2013, Kelvin W Sherlock
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* MPW Help utility.
*
* help topic
* does a cat of $ShellDirectory:Help:topic
*/
/*
* MPW 3.2
*
* C Help.c -o Help.c.o -r {SymOptions}
*
* Link {SymOptions} -w -c 'MPS ' -t MPST Help.c.o ∂
* -sn STDIO=Main ∂
* -sn INTENV=Main ∂
* -sn %A5Init=Main ∂
* "{Libraries}"Stubs.o ∂
* "{CLibraries}"StdCLib.o ∂
* "{Libraries}"Interface.o ∂
* "{Libraries}"Runtime.o ∂
* "{Libraries}"ToolLibs.o ∂
* -o Help
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *base(char *str)
{
char *rv = str;
char *tmp = str;
if (!str) return str;
for (tmp = str; *tmp; ++tmp)
{
char c = *tmp;
if (c == ':' || c == '/') rv = tmp + 1;
}
return rv;
}
void help(char *root, char *topic)
{
int l;
char *path;
FILE *fp;
// todo -- check if they're being stupid or malicious and
// handle / or : chars.
topic = base(topic);
if (!topic || !*topic)
{
return;
}
l = strlen(root) + strlen("Help:") + strlen(topic) + 1;
path = malloc(1);
if (!path)
{
fprintf(stderr, "### Help - Memory allocation failure.\n");
return;
}
sprintf(path, "%sHelp:%s", root, topic);
fp = fopen(path, "r");
free(path);
if (!fp)
{
fprintf(stderr, "### Help - \"%s\" was not found.\n", topic);
return;
}
for(;;)
{
char buffer[512];
int count;
count = fread(buffer, 1, sizeof(buffer), fp);
if (count == 0) break;
fwrite(buffer, 1, count, stdout);
}
fwrite("\r", 1, 1, stdout);
fclose(fp);
}
int main(int argc, char **argv)
{
char *root;
root = getenv("ShellDirectory");
if (!root || !*root)
{
fprintf(stderr, "### Help - $ShellDirectory is not defined.\n");
return 1;
}
if (argc == 1)
{
help(root, "MPW");
}
else
{
int i;
for (i = 1; i < argc; ++i)
{
help(root, argv[i]);
}
}
return 0;
}