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str.c
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str.c
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/* =====[ STR.C ]=========================================================
Description: Convert stings.
Compiled: MS-VC.
Compiler opt: See makefile.
Revisions:
Revisions:
REV DATE BY DESCRIPTION
---- -------- ---------- --------------------------------------
0.00 mm/dd/95 Peter Glen Initial version.
======================================================================= */
/* -------- System includes: -------------------------------------------- */
#include <stdbool.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
/* -------- Includes: --------------------------------------------------- */
#include "convert.h"
#include "hocdecl.h"
#include "str.h"
/* -------- Defines: ----------------------------------------------------- */
#define MIN(a,b) ((a>b) ? a : b)
/* -------- Implementation: ---------------------------------------------- */
/*
* bool str_esc(char *str, char *out, int lim)
*
* Expand escape sequence like 'C'.
*
* Spec: esc char '\\' (backslash)
*
* special characters: a : alert
* b : backspace
* f : f
* r : return
* n : newline
* t : tab
* v : vertical tab
* \\ : backslash
* xnn : hex numbered character
* nnn : dec numbered character
*
* The dec number overflow is interpreted as 2 dec numbered character +
* the following character interpreted normally.
*
*/
bool str_esc(const char *str, char *out, int lim)
{
const char *str2 = str;
bool ret_val = false;
*out = '\0';
if(!str)
return 0;
while(1)
{
*out = '\0';
if(!*str2)
break;
if(!lim)
{
ret_val = true;
break;
}
else if(str2-str+1 >= lim)
{
fprintf(stderr, "String too large for buffer of %i chars; truncated\n", lim-1);
ret_val = false;
break;
}
switch(*str2)
{
int tmp;
case '\\':
if(isdigit(*(str2+1)))
{
int len = 3;
tmp = dectoi(str2+1, len); // convert number
if(tmp > 255) // decimal overflow ?
len--;
tmp = dectoi(str2+1, len); // re-convert number
len = MIN(declen(str2+1), len);
*out = (char) tmp;
str2 += len;
}
else
{
switch(*(str2+1))
{
case 'x':
tmp = hextoi(str2+2, 2); // convert number
*out = (char) tmp;
str2 += MIN(hexlen(str2+2),2);
str2++;
break;
case 'a':
*out = 7;
str2++;
break;
case 'b':
*out = 8;
str2++;
break;
case 'f':
*out = 12;
str2++;
break;
case 'n':
*out = 10;
str2++;
break;
case 'r':
*out = 13;
str2++;
break;
case 't':
*out = 9;
str2++;
break;
case 'v':
*out = 11;
str2++;
break;
case '\\':
*out = '\\';
str2++;
break;
case '\'':
*out = '\'';
str2++;
break;
case '\"':
*out = '\"';
str2++;
break;
default:
*out = *str2;
str2++;
break;
}
}
break;
default:
*out = *str2;
break;
}
str2++; out++;
}
return ret_val;
}