Added fdkrncfg.c, the kernel configuration part of sys
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@318 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman
parent
6b297246a3
commit
e092c873fa
335
sys/fdkrncfg.c
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335
sys/fdkrncfg.c
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/***************************************************************************
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* *
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* FDKRNCFG.C - FreeDOS Kernel Configuration *
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* This is a simple little program that merely displays and/or changes *
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* the configuration options specified within the CONFIG section of *
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* the FreeDOS Kernel (if supported) *
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* *
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* Initially Written by Kenneth J. Davis Oct 11, 2001 (public domain) *
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* Future versions may contain copyrighted portions, if so the *
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* copyright holders should be listed after this line. *
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* Initial release - public domain *
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* *
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* merged into SYS by tom ehlert *
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***************************************************************************/
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/* This source compiled & tested with Borland C/C++ 3.1 + TC 2.01*/
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char VERSION[] = "v1.00";
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char PROGRAM[] = "SYS CONFIG";
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char KERNEL[] = "KERNEL.SYS";
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <io.h>
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#include <fcntl.h>
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#define FAR far
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#include "kconfig.h"
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KernelConfig cfg = {0};
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typedef unsigned char byte;
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typedef unsigned short word;
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typedef unsigned long dword;
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/* These structures need to be byte packed, if your compiler
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does not do this by default, add the appropriate command,
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such as #pragma pack(1) here, protected with #ifdefs of course.
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*/
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/* Displays command line syntax */
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void showUsage(void)
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{
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printf("FreeDOS Kernel Configuration %s\n", VERSION);
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printf("Usage: \n"
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" %s \n"
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" %s [/help | /?]\n"
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" %s [ [drive:][path]%s] [option=value ...] \n",
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PROGRAM, PROGRAM, PROGRAM, KERNEL);
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printf("\n");
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printf(" If no options are given, the current values are shown.\n");
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printf(" %/help or ? displays this usage information.\n"
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" [drive:][path]KERNEL.SYS specifies the kernel file to\n"
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" modify, if not given defaults to \\%s\n",
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KERNEL);
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printf("\n");
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printf(" option=value ... specifies one or more options and the values\n"
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" to set each to. If an option is given multiple times,\n"
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" the value set will be the rightmost one.\n");
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printf(" Current Options are: DLASORT=0|1, SHOWDRIVEASSIGNMENT=0|1\n");
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}
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/* simply reads in current configuration values, exiting program
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with an error message and error code unable to, otherwise
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cfg & kfile are valid on return.
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*/
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/* Reads in the current kernel configuration settings,
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return 0 on success, nonzero on error. If there was
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an actual error the return value is positive, if there
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were no errors, but the CONFIG section was not found
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then a negative value is returned. cfg is only altered
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if the return value is 0 (ie successfully found and
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read in the config section). The position of the file
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pointer on input does not matter, the file position
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upon return may be anywhere. The memory allocated for
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cfg should be freed to prevent memory leakage (it should
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not point to allocated memory on entry, as that memory
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will not be used, and will likely not be freed as a result).
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*/
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int readConfigSettings(int kfile, char *kfilename, KernelConfig *cfg)
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{
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int ch;
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int configBlkFound;
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word cfgSize;
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/* Seek to start of kernel file */
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if (lseek(kfile, 2, SEEK_SET) != 2)
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printf("can't seek to offset 2\n"),exit(1);
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if (read(kfile,cfg,sizeof(KernelConfig)) != sizeof(KernelConfig))
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printf("can't read %u bytes\n",sizeof(KernelConfig)),exit(1);
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if (memcmp(cfg->CONFIG, "CONFIG", 6) != 0)
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{
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printf("Error: no CONFIG section found in kernel file <%s>\n", kfilename);
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printf("Only FreeDOS kernels after 2025 contain a CONFIG section!\n");
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exit(1);
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}
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return 1;
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}
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/* Writes config values out to file.
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Returns 0 on success, nonzero on error.
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*/
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int writeConfigSettings(int kfile, KernelConfig *cfg)
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{
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/* Seek to CONFIG section at start of options of kernel file */
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if (lseek(kfile, 2, SEEK_SET) != 2)
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return 1;
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/* Write just the config option information out */
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if (write(kfile, cfg, sizeof(KernelConfig)) != sizeof(KernelConfig))
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return 1;
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/* successfully wrote out kernel config data */
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return 0;
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}
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/* Displays kernel configuration information */
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void displayConfigSettings(KernelConfig *cfg)
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{
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/* print known options and current value - only if available */
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if (cfg->ConfigSize >= 1)
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{
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printf("DLASORT=0x%02X Sort disks by drive order: *0=no, 1=yes\n",
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cfg->DLASortByDriveNo);
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}
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if (cfg->ConfigSize >= 2)
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{
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printf("SHOWDRIVEASSIGNMENT=0x%02X Show how drives assigned: *1=yes 0=no\n",
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cfg->InitDiskShowDriveAssignment);
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}
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if (cfg->ConfigSize >= 3)
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{
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printf("SKIPCONFIGSECONDS=%-2d time to wait for F5/F8 : *2 sec\n",
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cfg->SkipConfigSeconds);
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}
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#if 0 /* we assume that SYS is as current as the kernel */
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/* Print value any options added that are unknown as hex dump */
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if (cfg->configHdr.configSize > sizeof(ConfigData))
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{
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printf("Additional options are available, they are not currently\n"
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"supported by this tool. The current extra values are (in Hex):\n");
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for (i = 0; i < (cfg->configSize-sizeof(ConfigData)); i++)
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{
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if ((i%32) == 0) printf("\n");
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else if ((i%4) == 0) printf(" ");
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printf("%02X", (unsigned int)cfg->extra[i]);
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}
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printf("\n");
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}
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#endif
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printf("\n");
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}
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/* Sets the given location to a byte value if different,
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displays warning if values exceeds max
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*/
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void setByteOption(byte *option, char *value, word max, int *updated, char *name)
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{
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int optionValue;
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optionValue = atoi(value);
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if (optionValue > max)
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{
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printf("Warning: Option %s: Value <0x%02X> may be invalid!\n",
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name, (unsigned int)((byte)optionValue));
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}
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/* Don't bother updating if same value */
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if ((byte)optionValue != *option)
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{
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*option = (byte)optionValue;
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*updated = 1;
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}
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}
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/* Main, processes command line options and calls above
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functions as required.
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*/
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int FDKrnConfigMain(int argc,char **argv)
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{
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char *kfilename = KERNEL;
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int kfile;
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int updates = 0; /* flag used to indicate if we need to update kernel */
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int argstart,i;
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char *cptr;
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char *argptr;
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printf("FreeDOS System configurator %s \n", VERSION);
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/* 1st go through and just process arguments (help/filename/etc) */
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for (i = 2; i < argc; i++)
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{
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argptr = argv[i];
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/* is it an argument or an option specifier */
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if (argptr[0] == '-' || argptr[0] == '/')
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{
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switch(argptr[1])
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{
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case 'H':
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case 'h':
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case '?':
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showUsage();
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exit(0);
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default:
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printf("Invalid argument found <%s>.\nUse %s /help for usage.\n",
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argptr, PROGRAM);
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exit(1);
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}
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}
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}
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argstart = 2;
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argptr = argv[argstart];
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cptr = strchr(argptr, '=');
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if (argptr == 0)
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{
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showUsage();
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exit(1);
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}
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/* the first argument may be the kernel name */
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if (strchr(argptr, '=') == NULL)
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{
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kfilename = argptr;
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argstart++;
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}
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kfile = open(kfilename, O_RDWR | O_BINARY);
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if (kfile < 0)
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printf("Error: unable to open kernel file <%s>\n", kfilename),exit(1);
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/* now that we know the filename (default or given) get config info */
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readConfigSettings(kfile, kfilename, &cfg);
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for (i = argstart; i < argc; i++)
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{
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argptr = argv[i];
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if ((cptr = strchr(argptr,'=')) == NULL)
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goto illegal_arg;
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/* split argptr into 2 pieces and make cptr point to 2nd one */
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*cptr = '\0';
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cptr++;
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/* allow 3 valid characters */
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if (memicmp(argptr, "DLASORT",3) == 0)
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{
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setByteOption(&(cfg.DLASortByDriveNo),
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cptr, 1, &updates, "DLASORT");
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}
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else if (memicmp(argptr, "SHOWDRIVEASSIGNMENT",3) == 0)
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{
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setByteOption(&(cfg.InitDiskShowDriveAssignment),
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cptr, 1, &updates, "SHOWDRIVEASSIGNMENT");
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}
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else if (memicmp(argptr, "SKIPCONFIGSECONDS",3) == 0)
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{
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setByteOption(&(cfg.SkipConfigSeconds),
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cptr, 1, &updates, "SKIPCONFIGSECONDS");
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updates++;
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}
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else
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{
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illegal_arg:
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printf("Unknown option found <%s>.\nUse %s /help for usage.\n",
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argptr, PROGRAM);
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exit(1);
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}
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}
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/* write out new config values if modified */
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if (updates)
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{
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/* update it */
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if (writeConfigSettings(kfile, &cfg))
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{
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printf("Error: Unable to write configuration changes to kernel!\n");
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printf(" <%s>\n", kfilename);
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close(kfile);
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exit(1);
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}
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/* display new settings */
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printf("\nUpdated Kernel settings.\n");
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}
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else
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printf("Current Kernel settings.\n");
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/* display current settings */
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displayConfigSettings(&cfg);
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/* and done */
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close(kfile);
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return 0;
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}
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