fossil: import from plan 9

R=rsc
https://codereview.appspot.com/7988047

1 files changed, 112 insertions, 0 deletions

diff --git a/src/cmd/fossil/Ccli.c b/src/cmd/fossil/Ccli.c
new file mode 100644
index 00000000..775cb620
--- /dev/null
+++ b/src/cmd/fossil/Ccli.c
@@ -0,0 +1,112 @@
+#include "stdinc.h"
+
+#include "9.h"
+
+typedef struct {
+	char*	argv0;
+	int	(*cmd)(int, char*[]);
+} Cmd;
+
+static struct {
+	VtLock*	lock;
+	Cmd*	cmd;
+	int	ncmd;
+	int	hi;
+} cbox;
+
+enum {
+	NCmdIncr	= 20,
+};
+
+int
+cliError(char* fmt, ...)
+{
+	char *p;
+	va_list arg;
+
+	va_start(arg, fmt);
+	p = vsmprint(fmt, arg);
+	vtSetError("%s", p);
+	free(p);
+	va_end(arg);
+
+	return 0;
+}
+
+int
+cliExec(char* buf)
+{
+	int argc, i, r;
+	char *argv[20], *p;
+
+	p = vtStrDup(buf);
+	if((argc = tokenize(p, argv, nelem(argv)-1)) == 0){
+		vtMemFree(p);
+		return 1;
+	}
+	argv[argc] = 0;
+
+	if(argv[0][0] == '#'){
+		vtMemFree(p);
+		return 1;
+	}
+
+	vtLock(cbox.lock);
+	for(i = 0; i < cbox.hi; i++){
+		if(strcmp(cbox.cmd[i].argv0, argv[0]) == 0){
+			vtUnlock(cbox.lock);
+			if(!(r = cbox.cmd[i].cmd(argc, argv)))
+				consPrint("%s\n", vtGetError());
+			vtMemFree(p);
+			return r;
+		}
+	}
+	vtUnlock(cbox.lock);
+
+	consPrint("%s: - eh?\n", argv[0]);
+	vtMemFree(p);
+
+	return 0;
+}
+
+int
+cliAddCmd(char* argv0, int (*cmd)(int, char*[]))
+{
+	int i;
+	Cmd *opt;
+
+	vtLock(cbox.lock);
+	for(i = 0; i < cbox.hi; i++){
+		if(strcmp(argv0, cbox.cmd[i].argv0) == 0){
+			vtUnlock(cbox.lock);
+			return 0;
+		}
+	}
+	if(i >= cbox.hi){
+		if(cbox.hi >= cbox.ncmd){
+			cbox.cmd = vtMemRealloc(cbox.cmd,
+					(cbox.ncmd+NCmdIncr)*sizeof(Cmd));
+			memset(&cbox.cmd[cbox.ncmd], 0, NCmdIncr*sizeof(Cmd));
+			cbox.ncmd += NCmdIncr;
+		}
+	}
+
+	opt = &cbox.cmd[cbox.hi];
+	opt->argv0 = argv0;
+	opt->cmd = cmd;
+	cbox.hi++;
+	vtUnlock(cbox.lock);
+
+	return 1;
+}
+
+int
+cliInit(void)
+{
+	cbox.lock = vtLockAlloc();
+	cbox.cmd = vtMemAllocZ(NCmdIncr*sizeof(Cmd));
+	cbox.ncmd = NCmdIncr;
+	cbox.hi = 0;
+
+	return 1;
+}