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