FreeCalypso > hg > freecalypso-tools
view loadtools/buzplay.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 | 684eddecbc62 |
children |
line wrap: on
line source
/* * The actual functionality of fc-buzplay is implemented here. */ #include <sys/types.h> #include <ctype.h> #include <stdio.h> #include <string.h> #include <strings.h> #include <stdlib.h> cmd_play(argc, argv) char **argv; { FILE *f; char linebuf[256], *cp, *num1, *num2; int lineno; char *targv[4]; u_long n1, n2, total_ms; int rc, timeout; f = fopen(argv[1], "r"); if (!f) { perror(argv[1]); return(-1); } printf("Uploading the melody to the target\n"); targv[0] = "I"; targv[1] = 0; tpinterf_make_cmd(targv); if (tpinterf_send_cmd() < 0) { fclose(f); return(-1); } rc = tpinterf_pass_output(1); if (rc) { fclose(f); return(rc); } targv[0] = "E"; targv[3] = 0; total_ms = 0; 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(-1); } for (cp = linebuf; isspace(*cp); cp++) ; if (*cp == '\0' || *cp == '#') continue; if (!isdigit(*cp)) { inv: fprintf(stderr, "%s line %d: unexpected content\n", argv[1], lineno); fclose(f); return(-1); } for (num1 = cp; *cp && !isspace(*cp); cp++) if (!isdigit(*cp)) goto inv; if (isspace(*cp)) *cp++ = '\0'; while (isspace(*cp)) cp++; if (!isdigit(*cp)) goto inv; for (num2 = cp; *cp && !isspace(*cp); cp++) if (!isdigit(*cp)) goto inv; if (isspace(*cp)) *cp++ = '\0'; while (isspace(*cp)) cp++; if (*cp != '\0' && *cp != '#') goto inv; n1 = strtoul(num1, 0, 10); n2 = strtoul(num2, 0, 10); if (n1 > 255) { fprintf(stderr, "%s line %d: the tone number is out of range\n", argv[1], lineno); fclose(f); return(-1); } if (n2 < 1 || n2 > 0xFFFF) { fprintf(stderr, "%s line %d: the duration number is out of range\n", argv[1], lineno); fclose(f); return(-1); } /* send it to the target */ targv[1] = num1; targv[2] = num2; tpinterf_make_cmd(targv); if (tpinterf_send_cmd() < 0) { fclose(f); return(-1); } rc = tpinterf_pass_output(1); if (rc) { fclose(f); return(rc); } /* account for the duration */ total_ms += n2 * 5; } fclose(f); if (!total_ms) { fprintf(stderr, "%s is empty!\n", argv[1]); return(-1); } printf("Requesting play of the uploaded melody on the target\n"); targv[0] = "P"; targv[1] = 0; tpinterf_make_cmd(targv); if (tpinterf_send_cmd() < 0) return(-1); timeout = total_ms / 1000 + 2; return tpinterf_pass_output(timeout); }