FreeCalypso > hg > freecalypso-tools
view rvinterf/etmsync/dispatch.c @ 407:19e5a3e2f9c0
fcup-settime: moved time() retrieval a little closer to the output
A fundamental problem with all simple time transfer tools is that there is
always some delay between the time retrieval on the source system and that
transmitted time being set on the destination, and the resulting time
on the destination system is off by that delay amount. This delay cannot
be fully eliminated when working in a simple environment like ours,
but we should make our best effort to minimize it. In the present case,
moving the atinterf_init() call before the time() retrieval should make
a teensy-tiny improvement.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 11 Aug 2018 21:52:17 +0000 |
parents | e7502631a0f9 |
children |
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/* * This module implements the command dispatch for fc-fsio * and possibly other similar utilities in the future. */ #include <ctype.h> #include <stdio.h> #include <string.h> #include <strings.h> #include <stdlib.h> #include "cmdtab.h" #include "exitcodes.h" extern struct cmdtab cmdtab[]; parse_and_dispatch_cmd(cmd, is_script) char *cmd; { char *argv[MAX_CMD_ARGS+2]; char *cp, **ap; struct cmdtab *tp; for (cp = cmd; isspace(*cp); cp++) ; if (!*cp || *cp == '#') return(0); if (is_script) printf("Script command: %s\n", cp); argv[0] = cp; while (*cp && !isspace(*cp)) cp++; if (*cp) *cp++ = '\0'; for (tp = cmdtab; tp->cmd; tp++) if (!strcmp(tp->cmd, argv[0])) break; if (!tp->func) { fprintf(stderr, "error: no such command\n"); return(ERROR_USAGE); } for (ap = argv + 1; ; ) { while (isspace(*cp)) cp++; if (!*cp || *cp == '#') break; if (ap - argv - 1 >= tp->maxargs) { fprintf(stderr, "error: too many arguments\n"); return(ERROR_USAGE); } if (*cp == '"') { *ap++ = ++cp; while (*cp && *cp != '"') cp++; if (*cp != '"') { fprintf(stderr, "error: unterminated quoted string\n"); return(ERROR_USAGE); } *cp++ = '\0'; } else { *ap++ = cp; while (*cp && !isspace(*cp)) cp++; if (*cp) *cp++ = '\0'; } } if (ap - argv - 1 < tp->minargs) { fprintf(stderr, "error: too few arguments\n"); return(ERROR_USAGE); } *ap = 0; return tp->func(ap - argv, argv); } dispatch_ready_argv(argc, argv) char **argv; { struct cmdtab *tp; for (tp = cmdtab; tp->cmd; tp++) if (!strcmp(tp->cmd, argv[0])) break; if (!tp->func) { fprintf(stderr, "error: no such command\n"); return(ERROR_USAGE); } if (argc - 1 > tp->maxargs) { fprintf(stderr, "error: too many arguments\n"); return(ERROR_USAGE); } if (argc - 1 < tp->minargs) { fprintf(stderr, "error: too few arguments\n"); return(ERROR_USAGE); } return tp->func(argc, argv); } cmd_exec(argc, argv) char **argv; { FILE *f; char linebuf[512], *cp; int lineno, retval = 0; f = fopen(argv[1], "r"); if (!f) { perror(argv[1]); return(ERROR_USAGE); } for (lineno = 1; fgets(linebuf, sizeof linebuf, f); lineno++) { cp = index(linebuf, '\n'); if (!cp) { fprintf(stderr, "%s line %d: missing newline\n", argv[1], lineno); fclose(f); return(ERROR_USAGE); } *cp = '\0'; retval = parse_and_dispatch_cmd(linebuf, 1); if (retval) break; } fclose(f); return(retval); } cmd_exit() { exit(0); }