File content as of revision 1:c229c3ceb909:

#include "mbed.h"
#define _EXTERN_ extern
#include "main.h"
#include "cio.h"
#include <cctype>

// Character I/O functions

// Get a character but handle backspace
// However, since we don't understand the start of a line
// Don't print backspaces
// Return is a non-zero character
int getachar(void)
{
    int c=0;
    while (!c) {
        c=pc.getc();
        if (c==0x7f) c=8;  // backspace
        if (c!=8) pc.putc(c);
        if (c=='\n') c='\r';
    }
    return c;
}





// Get a token (number)
// basically we skip anything that doesn't look
// like a hex number (even in decimal mode)
// so we skip comma, quotes, etc. in CSV
// Return: -1 - Exit via Esc, Semicolon or CNTL_Z
// 0 - ok
// 1 - long token
// Odd input may cause odd results (for example floating point 1.2FF or something
int gettoken(int type)
{
    int ip=0;
    int c;
    bool good;
    do {
        good=true;
        c=getachar();  // get character
        if (c==27 || c==';' || c==26) return -1;   // escape, semicolon, or ^Z returns -1 (stop)
        if (c==8 && ip!=0) {
            ip--;    // backspace not at first position
            pc.putc(8);
            pc.putc(' ');
            pc.putc(8);
        }
        if (c==8) continue;  // any backspace
        if (type==NUM_DEC && (c=='x' || c=='X')) type=NUM_HEX;  // decimal to hex if you see 0x

        switch (type) {
            case NUM_HEX:
                good=isxdigit(c)||c=='x'||c=='X';  // hex digits (including 0x)
                break;
            case NUM_DEC:
                good=isdigit(c);   // decimal digits
                break;
            case NUM_FLT:
                good=isdigit(c)||c=='.'||c=='-'||c=='e'||c=='E';  // simple floating point
                break;
        }
        if (!good) { // illegal character?
            if (ip) {
                ibuf[ip]='\0';   // got something
                return 0;
            } else
                continue;   // just skip leading cruft
        }
        if (ip<sizeof(ibuf)-1) ibuf[ip++]=c;  // accumulate
    } while (1);
}


// Get a token and convert to a number
int getnum(unsigned int *v, int type)
{
    int val, rc, forcehex=0;
    if (gettoken(type)<0) return -1;
    if (ibuf[0]=='0' && (ibuf[1]=='x' || ibuf[1]=='X')) {
        forcehex=2;
        type=0;
    }
// Get number from input buffer (forcehex skips 0x)
    rc=sscanf(ibuf+forcehex,type?"%d":"%x",&val);
    if (rc && v) *v=val;
    return rc==-1?0:rc;
}

// Get decimal number
int getdec(unsigned int *v)
{
    return getnum(v,NUM_DEC);
}


// Get hex number
int gethex(unsigned int *v)
{
    return getnum(v,NUM_HEX);
}

// Get float number
int getfloat(float *v)
{
    int rv;
    float vv;
    if (gettoken(NUM_FLT)<0) return -1;
    rv=sscanf(ibuf,"%f",&vv);
    if (rv && v) *v=vv;
    return rv;
}