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#include <stdio.h>
#include <ctype.h>
#include "xtdio.h"
/* ------------------------------------------------------------------
* Definitions Section:
*/
#define MAXCNT 65535
/* ------------------------------------------------------------------
* Source Code:
*/
/* stpnxt: returns a pointer to the next argument in the given string,
* assuming a %d, %s, %f, etc. code was used to interpret the
* present argument.
*/
#ifdef __PROTOTYPE__
char *stpnxt(
char *s, /* source string */
char *fmt) /* format control string (ie. format control code string) */
#else
char *stpnxt(s,fmt)
char *s; /* source string */
char *fmt; /* format control string (ie. format control code string) */
#endif
{
char *ss;
int cmax;
/* if s is NULL return NULL */
if(s == NULL) {
return (char *) NULL;
}
/* process control string */
for(ss= s; *s && *fmt ; ++fmt, ss= s) {
/* scan code processing */
if(*fmt == '%') {
++fmt;
/* %[-]###.: handle predecessor stuff */
if(*fmt == '-') ++fmt;
if(*fmt && isdigit(*fmt)) {
sscanf(fmt,"%d",&cmax);
while(*fmt && (isdigit(*fmt) || *fmt == '.')) ++fmt;
}
else cmax= MAXCNT;
/* %...l.: remove the 'l' from consideration
* %...h.: remove the 'h' from consideration
*/
if(*fmt == 'l' || *fmt == 'h') ++fmt;
/* handle the format code character */
switch(*fmt) {
/* %s: string processing */
case 's':
while(*s && isspace(*s)) ++s;
while(*s && !isspace(*s)) ++s;
break;
/* %c: character processing */
case 'c':
if(*s) ++s;
break;
/* %x: hexadecimal processing */
case 'x':
s= stpblk(s);
ss= s;
if(*s == '+' || *s == '-') ++s;
if(s[0] == '0' && s[1] == 'x') s+= 2;
while(*s && (isdigit(*s) || (*s >= 'a' && *s <= 'f') || (*s >= 'A' && *s <= 'F'))) ++s;
break;
/* %o: octal processing */
case 'o':
while(*s && isspace(*s)) ++s;
ss= s;
if(*s == '+' || *s == '-') ++s;
while(*s && *s >= '0' && *s <= '7') ++s;
break;
/* %d, %e, %f, %g, %u: integer and floating point number processing */
case 'd':
case 'e':
case 'f':
case 'g':
case 'u':
while(*s && isspace(*s)) ++s;
ss= s;
if(*s == '-' || *s == '+') ++s;
while(*s && isdigit(*s)) ++s;
if(*fmt == 'd') break;
if(*s == '.') ++s;
while(*s && isdigit(*s)) ++s;
if(*s == 'e') { /* exponent handling */
++s;
if(*s == '-' || *s == '+') ++s;
while(isdigit(*s) && *s) ++s;
}
break;
/* %%: single character processing */
case '%':
while(*s && isspace(*s)) ++s;
if(*s != *fmt) {
return s;
}
break;
/* %b: slight extension, skips over blanks */
case 'b':
while(*s && isspace(*s)) ++s;
break;
/* unknown */
default:
error(XTDIO_WARNING,"unknown stpnxt code <%s%c%s>\n",
RD_MAGENTA,
*fmt,
RD_GREEN);
break;
}
}
/* white space in control string skipping */
else if(*fmt && isspace(*fmt)) continue;
/* non-white space: must match string */
else {
while(*s && isspace(*s)) ++s;
if(*s != *fmt) {
return s;
}
else { /* s and c match, so continue forth */
++s;
continue;
}
}
if(s <= ss) {
return ss;
}
} /* c: loop */
return s;
}
/* --------------------------------------------------------------------- */
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