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#include <u.h>
#include <libc.h>
#include <bio.h>
#include "../common/common.h"
#include "tr2post.h"
#undef isspace
#define isspace risspace
int
isspace(Rune r)
{
return(r==' ' || r=='\t' || r=='\n' || r == '\r' || r=='\f');
}
int
Bskipws(Biobuf *bp) {
int r;
int sindex = 0;
/* skip over initial white space */
do {
r = Bgetrune(bp);
if (r == '\n') inputlineno++;
sindex++;
} while (r>=0 && isspace(r));
if (r<0) {
return(-1);
} else if (!isspace(r)) {
Bungetrune(bp);
--sindex;
}
return(sindex);
}
int
asc2dig(char c, int base) {
if (c >= '0' && c <= '9'){
if (base == 8 && c > '7') return(-1);
else return(c - '0');
}
if (base == 16){
if (c >= 'a' && c <= 'f') return(10 + c - 'a');
else if (c >= 'A' && c <= 'F') return(10 + c - 'A');
}
return(-1);
}
/* get a string of type: "d" for decimal integer, "u" for unsigned,
* "s" for string", "c" for char,
* return the number of characters gotten for the field. If nothing
* was gotten and the end of file was reached, a negative value
* from the Bgetrune is returned.
*/
int
Bgetfield(Biobuf *bp, int type, void *thing, int size) {
int r;
Rune R;
int sindex = 0, i, j, n = 0;
int negate = 0;
int base = 10;
BOOLEAN bailout = FALSE;
int dig;
unsigned int u = 0;
r = 0;
/* skip over initial white space */
if (Bskipws(bp) < 0)
return(-1);
switch (type) {
case 'd':
while (!bailout && (r = Bgetrune(bp))>=0) {
switch (sindex++) {
case 0:
switch (r) {
case '-':
negate = 1;
continue;
case '+':
continue;
case '0':
base = 8;
continue;
default:
break;
}
break;
case 1:
if ((r == 'x' || r == 'X') && base == 8) {
base = 16;
continue;
}
}
if ((dig = asc2dig(r, base)) == -1) bailout = TRUE;
else n = dig + (n * base);
}
if (r < 0) return(-1);
*(int *)thing = (negate)?-n:n;
Bungetrune(bp);
break;
case 'u':
while (!bailout && (r = Bgetrune(bp))>=0) {
switch (sindex++) {
case 0:
if (r == '0') {
base = 8;
continue;
}
break;
case 1:
if ((r == 'x' || r == 'X') && base == 8) {
base = 16;
continue;
}
}
if ((dig = asc2dig(r, base)) == -1) bailout = TRUE;
else u = dig + (n * base);
}
*(int *)thing = u;
if (r < 0) return(-1);
Bungetrune(bp);
break;
case 's':
j = 0;
while ((size>j+UTFmax) && (r = Bgetrune(bp))>=0 && !isspace(r)) {
R = r;
i = runetochar(&(((char *)thing)[j]), &R);
j += i;
sindex++;
}
((char *)thing)[j++] = '\0';
if (r < 0) return(-1);
Bungetrune(bp);
break;
case 'r':
if ((r = Bgetrune(bp))>=0) {
*(Rune *)thing = r;
sindex++;
return(sindex);
}
if (r <= 0) return(-1);
Bungetrune(bp);
break;
default:
return(-2);
}
if (r < 0 && sindex == 0)
return(r);
else if (bailout && sindex == 1) {
return(0);
} else
return(sindex);
}
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