FreeCalypso > hg > freecalypso-citrine
view lldbg/cmdentry.c @ 13:a2723de00e06
L1/audio_cfile: untouched LoCosto source modules removed
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 Jun 2016 06:21:21 +0000 |
parents | 75a11d740a02 |
children |
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/* * This module implements ASCII command entry via the serial port, * with normal echo and minimal editing (rubout and kill). * * The command string buffer is bss-allocated here as well. It is * sized to allow a maximum-size S-record to be sent as a command, * as that is how we expect flash loading and XRAM chain-loading * to be done. */ #define MAXCMD 527 char lldbg_command[MAXCMD+1]; /* * The command_entry() function takes no arguments, and begins by waiting * for serial input - hence the prompt should be printed before calling it. * * This function returns when one of the following characters is received: * CR - accepts the command * ^C or ^U - cancels the command * * The return value is non-zero if a non-empty command was accepted with CR, * or 0 if the user hit CR with no input or if the command was canceled * with ^C or ^U. In any case a CRLF is sent out the serial port * to close the input echo line before this function returns. */ lldbg_command_entry() { int inlen, ch; for (inlen = 0; ; ) { ch = lldbg_getchar(); if (ch >= ' ' && ch <= '~') { if (inlen < MAXCMD) { lldbg_command[inlen++] = ch; lldbg_putchar(ch); } else /* putchar(7) */; continue; } switch (ch) { case '\r': case '\n': lldbg_command[inlen] = '\0'; lldbg_putchar('\n'); return(inlen); case '\b': /* BS */ case 0x7F: /* DEL */ if (inlen) { lldbg_putchar('\b'); lldbg_putchar(' '); lldbg_putchar('\b'); inlen--; } else /* putchar(7) */; continue; case 0x03: /* ^C */ lldbg_putchar('^'); lldbg_putchar('C'); lldbg_putchar('\n'); return(0); case 0x15: /* ^U */ lldbg_putchar('^'); lldbg_putchar('U'); lldbg_putchar('\n'); return(0); default: /* putchar(7) */; } } }