Create "mmc" utility
This commit was made by Chris Ball, but reuses framework code from
Goffredo's btrfs-progs/btrfs.c.
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..276e996
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,46 @@
+CC = gcc
+AM_CFLAGS = -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2
+CFLAGS = -g -O0
+objects = mmc.o
+
+CHECKFLAGS= -Wall -Werror -Wuninitialized -Wundef
+
+DEPFLAGS = -Wp,-MMD,$(@D)/.$(@F).d,-MT,$@
+
+INSTALL = install
+prefix ?= /usr/local
+bindir = $(prefix)/bin
+LIBS=
+RESTORE_LIBS=
+
+progs = mmc
+
+# make C=1 to enable sparse
+ifdef C
+ check = sparse $(CHECKFLAGS)
+endif
+
+all: $(progs) manpages
+
+.c.o:
+ifdef C
+ $(check) $<
+endif
+ $(CC) $(CHECKFLAGS) $(AM_CFLAGS) $(DEPFLAGS) $(CFLAGS) -c $<
+
+mmc: $(objects)
+ $(CC) $(CFLAGS) -o $@ $(objects) $(LDFLAGS) $(LIBS)
+
+manpages:
+ cd man && make
+
+install-man:
+ cd man && make install
+
+clean:
+ rm -f $(progs) $(objects)
+ cd man && make clean
+
+install: $(progs) install-man
+ $(INSTALL) -m755 -d $(DESTDIR)$(bindir)
+ $(INSTALL) $(progs) $(DESTDIR)$(bindir)
diff --git a/man/Makefile b/man/Makefile
new file mode 100644
index 0000000..c8957f6
--- /dev/null
+++ b/man/Makefile
@@ -0,0 +1,2 @@
+all:
+clean:
diff --git a/mmc.c b/mmc.c
new file mode 100644
index 0000000..787df1d
--- /dev/null
+++ b/mmc.c
@@ -0,0 +1,326 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ * (This code is based on btrfs-progs/btrfs.c.)
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MMC_VERSION "0.1"
+
+#define BASIC_HELP 0
+#define ADVANCED_HELP 1
+
+typedef int (*CommandFunction)(int argc, char **argv);
+
+struct Command {
+ CommandFunction func; /* function which implements the command */
+ int nargs; /* if == 999, any number of arguments
+ if >= 0, number of arguments,
+ if < 0, _minimum_ number of arguments */
+ char *verb; /* verb */
+ char *help; /* help lines; from the 2nd line onward they
+ are automatically indented */
+ char *adv_help; /* advanced help message; from the 2nd line
+ onward they are automatically indented */
+
+ /* the following fields are run-time filled by the program */
+ char **cmds; /* array of subcommands */
+ int ncmds; /* number of subcommand */
+};
+
+static struct Command commands[] = {
+ /*
+ * avoid short commands different for the case only
+ */
+ { 0, 0, 0, 0 }
+};
+
+static char *get_prgname(char *programname)
+{
+ char *np;
+ np = strrchr(programname,'/');
+ if(!np)
+ np = programname;
+ else
+ np++;
+
+ return np;
+}
+
+static void print_help(char *programname, struct Command *cmd, int helptype)
+{
+ char *pc;
+
+ printf("\t%s %s ", programname, cmd->verb );
+
+ if (helptype == ADVANCED_HELP && cmd->adv_help)
+ for(pc = cmd->adv_help; *pc; pc++){
+ putchar(*pc);
+ if(*pc == '\n')
+ printf("\t\t");
+ }
+ else
+ for(pc = cmd->help; *pc; pc++){
+ putchar(*pc);
+ if(*pc == '\n')
+ printf("\t\t");
+ }
+
+ putchar('\n');
+}
+
+static void help(char *np)
+{
+ struct Command *cp;
+
+ printf("Usage:\n");
+ for( cp = commands; cp->verb; cp++ )
+ print_help(np, cp, BASIC_HELP);
+
+ printf("\n\t%s help|--help|-h\n\t\tShow the help.\n",np);
+ printf("\n\t%s <cmd> --help\n\t\tShow detailed help for a command or subset of commands.\n",np);
+ printf("\n%s\n", MMC_VERSION);
+}
+
+static int split_command(char *cmd, char ***commands)
+{
+ int c, l;
+ char *p, *s;
+
+ for( *commands = 0, l = c = 0, p = s = cmd ; ; p++, l++ ){
+ if ( *p && *p != ' ' )
+ continue;
+
+ /* c + 2 so that we have room for the null */
+ (*commands) = realloc( (*commands), sizeof(char *)*(c + 2));
+ (*commands)[c] = strndup(s, l);
+ c++;
+ l = 0;
+ s = p+1;
+ if( !*p ) break;
+ }
+
+ (*commands)[c] = 0;
+ return c;
+}
+
+/*
+ This function checks if the passed command is ambiguous
+*/
+static int check_ambiguity(struct Command *cmd, char **argv){
+ int i;
+ struct Command *cp;
+ /* check for ambiguity */
+ for( i = 0 ; i < cmd->ncmds ; i++ ){
+ int match;
+ for( match = 0, cp = commands; cp->verb; cp++ ){
+ int j, skip;
+ char *s1, *s2;
+
+ if( cp->ncmds < i )
+ continue;
+
+ for( skip = 0, j = 0 ; j < i ; j++ )
+ if( strcmp(cmd->cmds[j], cp->cmds[j])){
+ skip=1;
+ break;
+ }
+ if(skip)
+ continue;
+
+ if( !strcmp(cmd->cmds[i], cp->cmds[i]))
+ continue;
+ for(s2 = cp->cmds[i], s1 = argv[i+1];
+ *s1 == *s2 && *s1; s1++, s2++ ) ;
+ if( !*s1 )
+ match++;
+ }
+ if(match){
+ int j;
+ fprintf(stderr, "ERROR: in command '");
+ for( j = 0 ; j <= i ; j++ )
+ fprintf(stderr, "%s%s",j?" ":"", argv[j+1]);
+ fprintf(stderr, "', '%s' is ambiguous\n",argv[j]);
+ return -2;
+ }
+ }
+ return 0;
+}
+
+/*
+ * This function, compacts the program name and the command in the first
+ * element of the '*av' array
+ */
+static int prepare_args(int *ac, char ***av, char *prgname, struct Command *cmd ){
+
+ char **ret;
+ int i;
+ char *newname;
+
+ ret = (char **)malloc(sizeof(char*)*(*ac+1));
+ newname = (char*)malloc(strlen(prgname)+strlen(cmd->verb)+2);
+ if( !ret || !newname ){
+ free(ret);
+ free(newname);
+ return -1;
+ }
+
+ ret[0] = newname;
+ for(i=0; i < *ac ; i++ )
+ ret[i+1] = (*av)[i];
+
+ strcpy(newname, prgname);
+ strcat(newname, " ");
+ strcat(newname, cmd->verb);
+
+ (*ac)++;
+ *av = ret;
+
+ return 0;
+
+}
+
+/*
+ This function performs the following jobs:
+ - show the help if '--help' or 'help' or '-h' are passed
+ - verify that a command is not ambiguous, otherwise show which
+ part of the command is ambiguous
+ - if after a (even partial) command there is '--help' show detailed help
+ for all the matching commands
+ - if the command doesn't match show an error
+ - finally, if a command matches, they return which command matched and
+ the arguments
+
+ The function return 0 in case of help is requested; <0 in case
+ of uncorrect command; >0 in case of matching commands
+ argc, argv are the arg-counter and arg-vector (input)
+ *nargs_ is the number of the arguments after the command (output)
+ **cmd_ is the invoked command (output)
+ ***args_ are the arguments after the command
+
+*/
+static int parse_args(int argc, char **argv,
+ CommandFunction *func_,
+ int *nargs_, char **cmd_, char ***args_ )
+{
+ struct Command *cp;
+ struct Command *matchcmd=0;
+ char *prgname = get_prgname(argv[0]);
+ int i=0, helprequested=0;
+
+ if( argc < 2 || !strcmp(argv[1], "help") ||
+ !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")){
+ help(prgname);
+ return 0;
+ }
+
+ for( cp = commands; cp->verb; cp++ )
+ if( !cp->ncmds)
+ cp->ncmds = split_command(cp->verb, &(cp->cmds));
+
+ for( cp = commands; cp->verb; cp++ ){
+ int match;
+
+ if( argc-1 < cp->ncmds )
+ continue;
+ for( match = 1, i = 0 ; i < cp->ncmds ; i++ ){
+ char *s1, *s2;
+ s1 = cp->cmds[i];
+ s2 = argv[i+1];
+
+ for(s2 = cp->cmds[i], s1 = argv[i+1];
+ *s1 == *s2 && *s1;
+ s1++, s2++ ) ;
+ if( *s1 ){
+ match=0;
+ break;
+ }
+ }
+
+ /* If you understand why this code works ...
+ you are a genious !! */
+ if(argc>i+1 && !strcmp(argv[i+1],"--help")){
+ if(!helprequested)
+ printf("Usage:\n");
+ print_help(prgname, cp, ADVANCED_HELP);
+ helprequested=1;
+ continue;
+ }
+
+ if(!match)
+ continue;
+
+ matchcmd = cp;
+ *nargs_ = argc-matchcmd->ncmds-1;
+ *cmd_ = matchcmd->verb;
+ *args_ = argv+matchcmd->ncmds+1;
+ *func_ = cp->func;
+
+ break;
+ }
+
+ if(helprequested){
+ printf("\n%s\n", MMC_VERSION);
+ return 0;
+ }
+
+ if(!matchcmd){
+ fprintf( stderr, "ERROR: unknown command '%s'\n",argv[1]);
+ help(prgname);
+ return -1;
+ }
+
+ if(check_ambiguity(matchcmd, argv))
+ return -2;
+
+ /* check the number of argument */
+ if (matchcmd->nargs < 0 && matchcmd->nargs < -*nargs_ ){
+ fprintf(stderr, "ERROR: '%s' requires minimum %d arg(s)\n",
+ matchcmd->verb, -matchcmd->nargs);
+ return -2;
+ }
+ if(matchcmd->nargs >= 0 && matchcmd->nargs != *nargs_ && matchcmd->nargs != 999){
+ fprintf(stderr, "ERROR: '%s' requires %d arg(s)\n",
+ matchcmd->verb, matchcmd->nargs);
+ return -2;
+ }
+
+ if (prepare_args( nargs_, args_, prgname, matchcmd )){
+ fprintf(stderr, "ERROR: not enough memory\\n");
+ return -20;
+ }
+
+
+ return 1;
+}
+int main(int ac, char **av )
+{
+ char *cmd=0, **args=0;
+ int nargs=0, r;
+ CommandFunction func=0;
+
+ r = parse_args(ac, av, &func, &nargs, &cmd, &args);
+ if( r <= 0 ){
+ /* error or no command to parse*/
+ exit(-r);
+ }
+
+ exit(func(nargs, args));
+}
+