#include "exec.h"

#ifdef LIBSCOMM_FREESTANDING
int strcmp(const char *s1, const char *s2) {
	while (*s1 == *s2) {
		if (!*s1)
			break;
		s1++;
		s2++;
	}

	return *s1 - *s2;
}
#else
# include <string.h>
#endif

struct libscomm_cmd *hg_bsearch(const char *name, const struct libscomm_cmd_store *cmds) {
	size_t lower = 0, upper = cmds->len-1;
	size_t i;
	int rel;

	while (upper >= lower) {
		i = (upper - lower)/2 + lower;
		rel = strcmp(name, cmds->arr[i].name);
		/* x > cmds[i] */
		if (rel > 0)
			lower = i + 1;
		/* x < cmds[i] */
		else if (rel < 0)
			upper = i - 1;
		else
			return &cmds->arr[i];
	}
	return NULL;
}

int libscomm_exec(const struct libscomm_cmd_store *cmds, struct libscomm_line *ln) {
	struct libscomm_cmd *cmd;

	cmd = hg_bsearch(ln->buf[ln->name], cmds);
	if (!cmd)
		return LIBSCOMM_NOT_FOUND;
	return cmd->exec(ln);
}