4.3BSD - /usr/src/lib/libc/stdio/doscan.c

   1: #if defined(LIBC_SCCS) && !defined(lint)
   2: static char sccsid[] = "@(#)doscan.c	5.2 (Berkeley) 3/9/86";
   3: #endif LIBC_SCCS and not lint
   4: 
   5: #include <stdio.h>
   6: #include    <ctype.h>
   7: 
   8: #define SPC 01
   9: #define STP 02
  10: 
  11: #define SHORT   0
  12: #define REGULAR 1
  13: #define LONG    2
  14: #define INT 0
  15: #define FLOAT   1
  16: 
  17: static char *_getccl();
  18: 
  19: static char _sctab[256] = {
  20:     0,0,0,0,0,0,0,0,
  21:     0,SPC,SPC,0,0,0,0,0,
  22:     0,0,0,0,0,0,0,0,
  23:     0,0,0,0,0,0,0,0,
  24:     SPC,0,0,0,0,0,0,0,
  25:     0,0,0,0,0,0,0,0,
  26:     0,0,0,0,0,0,0,0,
  27:     0,0,0,0,0,0,0,0,
  28: };
  29: 
  30: _doscan(iop, fmt, argp)
  31: FILE *iop;
  32: register char *fmt;
  33: register int **argp;
  34: {
  35:     register int ch;
  36:     int nmatch, len, ch1;
  37:     int **ptr, fileended, size;
  38: 
  39:     nmatch = 0;
  40:     fileended = 0;
  41:     for (;;) switch (ch = *fmt++) {
  42:     case '\0':
  43:         return (nmatch);
  44:     case '%':
  45:         if ((ch = *fmt++) == '%')
  46:             goto def;
  47:         ptr = 0;
  48:         if (ch != '*')
  49:             ptr = argp++;
  50:         else
  51:             ch = *fmt++;
  52:         len = 0;
  53:         size = REGULAR;
  54:         while (isdigit(ch)) {
  55:             len = len*10 + ch - '0';
  56:             ch = *fmt++;
  57:         }
  58:         if (len == 0)
  59:             len = 30000;
  60:         if (ch=='l') {
  61:             size = LONG;
  62:             ch = *fmt++;
  63:         } else if (ch=='h') {
  64:             size = SHORT;
  65:             ch = *fmt++;
  66:         } else if (ch=='[')
  67:             fmt = _getccl(fmt);
  68:         if (isupper(ch)) {
  69:             ch = tolower(ch);
  70:             size = LONG;
  71:         }
  72:         if (ch == '\0')
  73:             return(-1);
  74:         if (_innum(ptr, ch, len, size, iop, &fileended) && ptr)
  75:             nmatch++;
  76:         if (fileended)
  77:             return(nmatch? nmatch: -1);
  78:         break;
  79: 
  80:     case ' ':
  81:     case '\n':
  82:     case '\t':
  83:         while ((ch1 = getc(iop))==' ' || ch1=='\t' || ch1=='\n')
  84:             ;
  85:         if (ch1 != EOF)
  86:             ungetc(ch1, iop);
  87:         break;
  88: 
  89:     default:
  90:     def:
  91:         ch1 = getc(iop);
  92:         if (ch1 != ch) {
  93:             if (ch1==EOF)
  94:                 return(-1);
  95:             ungetc(ch1, iop);
  96:             return(nmatch);
  97:         }
  98:     }
  99: }
 100: 
 101: static
 102: _innum(ptr, type, len, size, iop, eofptr)
 103: int **ptr, *eofptr;
 104: FILE *iop;
 105: {
 106:     extern double atof();
 107:     register char *np;
 108:     char numbuf[64];
 109:     register c, base;
 110:     int expseen, scale, negflg, c1, ndigit;
 111:     long lcval;
 112: 
 113:     if (type=='c' || type=='s' || type=='[')
 114:         return(_instr(ptr? *(char **)ptr: (char *)NULL, type, len, iop, eofptr));
 115:     lcval = 0;
 116:     ndigit = 0;
 117:     scale = INT;
 118:     if (type=='e'||type=='f')
 119:         scale = FLOAT;
 120:     base = 10;
 121:     if (type=='o')
 122:         base = 8;
 123:     else if (type=='x')
 124:         base = 16;
 125:     np = numbuf;
 126:     expseen = 0;
 127:     negflg = 0;
 128:     while ((c = getc(iop))==' ' || c=='\t' || c=='\n');
 129:     if (c=='-') {
 130:         negflg++;
 131:         *np++ = c;
 132:         c = getc(iop);
 133:         len--;
 134:     } else if (c=='+') {
 135:         len--;
 136:         c = getc(iop);
 137:     }
 138:     for ( ; --len>=0; *np++ = c, c = getc(iop)) {
 139:         if (isdigit(c)
 140:          || base==16 && ('a'<=c && c<='f' || 'A'<=c && c<='F')) {
 141:             ndigit++;
 142:             if (base==8)
 143:                 lcval <<=3;
 144:             else if (base==10)
 145:                 lcval = ((lcval<<2) + lcval)<<1;
 146:             else
 147:                 lcval <<= 4;
 148:             c1 = c;
 149:             if (isdigit(c))
 150:                 c -= '0';
 151:             else if ('a'<=c && c<='f')
 152:                 c -= 'a'-10;
 153:             else
 154:                 c -= 'A'-10;
 155:             lcval += c;
 156:             c = c1;
 157:             continue;
 158:         } else if (c=='.') {
 159:             if (base!=10 || scale==INT)
 160:                 break;
 161:             ndigit++;
 162:             continue;
 163:         } else if ((c=='e'||c=='E') && expseen==0) {
 164:             if (base!=10 || scale==INT || ndigit==0)
 165:                 break;
 166:             expseen++;
 167:             *np++ = c;
 168:             c = getc(iop);
 169:             if (c!='+'&&c!='-'&&('0'>c||c>'9'))
 170:                 break;
 171:         } else
 172:             break;
 173:     }
 174:     if (negflg)
 175:         lcval = -lcval;
 176:     if (c != EOF) {
 177:         ungetc(c, iop);
 178:         *eofptr = 0;
 179:     } else
 180:         *eofptr = 1;
 181:     if (ptr==NULL || np==numbuf || (negflg && np==numbuf+1) )/* gene dykes*/
 182:         return(0);
 183:     *np++ = 0;
 184:     switch((scale<<4) | size) {
 185: 
 186:     case (FLOAT<<4) | SHORT:
 187:     case (FLOAT<<4) | REGULAR:
 188:         **(float **)ptr = atof(numbuf);
 189:         break;
 190: 
 191:     case (FLOAT<<4) | LONG:
 192:         **(double **)ptr = atof(numbuf);
 193:         break;
 194: 
 195:     case (INT<<4) | SHORT:
 196:         **(short **)ptr = lcval;
 197:         break;
 198: 
 199:     case (INT<<4) | REGULAR:
 200:         **(int **)ptr = lcval;
 201:         break;
 202: 
 203:     case (INT<<4) | LONG:
 204:         **(long **)ptr = lcval;
 205:         break;
 206:     }
 207:     return(1);
 208: }
 209: 
 210: static
 211: _instr(ptr, type, len, iop, eofptr)
 212: register char *ptr;
 213: register FILE *iop;
 214: int *eofptr;
 215: {
 216:     register ch;
 217:     register char *optr;
 218:     int ignstp;
 219: 
 220:     *eofptr = 0;
 221:     optr = ptr;
 222:     if (type=='c' && len==30000)
 223:         len = 1;
 224:     ignstp = 0;
 225:     if (type=='s')
 226:         ignstp = SPC;
 227:     while ((ch = getc(iop)) != EOF && _sctab[ch] & ignstp)
 228:         ;
 229:     ignstp = SPC;
 230:     if (type=='c')
 231:         ignstp = 0;
 232:     else if (type=='[')
 233:         ignstp = STP;
 234:     while (ch!=EOF && (_sctab[ch]&ignstp)==0) {
 235:         if (ptr)
 236:             *ptr++ = ch;
 237:         if (--len <= 0)
 238:             break;
 239:         ch = getc(iop);
 240:     }
 241:     if (ch != EOF) {
 242:         if (len > 0)
 243:             ungetc(ch, iop);
 244:         *eofptr = 0;
 245:     } else
 246:         *eofptr = 1;
 247:     if (ptr && ptr!=optr) {
 248:         if (type!='c')
 249:             *ptr++ = '\0';
 250:         return(1);
 251:     }
 252:     return(0);
 253: }
 254: 
 255: static char *
 256: _getccl(s)
 257: register unsigned char *s;
 258: {
 259:     register c, t;
 260: 
 261:     t = 0;
 262:     if (*s == '^') {
 263:         t++;
 264:         s++;
 265:     }
 266:     for (c = 0; c < (sizeof _sctab / sizeof _sctab[0]); c++)
 267:         if (t)
 268:             _sctab[c] &= ~STP;
 269:         else
 270:             _sctab[c] |= STP;
 271:     if ((c = *s) == ']' || c == '-') {  /* first char is special */
 272:         if (t)
 273:             _sctab[c] |= STP;
 274:         else
 275:             _sctab[c] &= ~STP;
 276:         s++;
 277:     }
 278:     while ((c = *s++) != ']') {
 279:         if (c==0)
 280:             return((char *)--s);
 281:         else if (c == '-' && *s != ']' && s[-2] < *s) {
 282:             for (c = s[-2] + 1; c < *s; c++)
 283:                 if (t)
 284:                     _sctab[c] |= STP;
 285:                 else
 286:                     _sctab[c] &= ~STP;
 287:         } else if (t)
 288:             _sctab[c] |= STP;
 289:         else
 290:             _sctab[c] &= ~STP;
 291:     }
 292:     return((char *)s);
 293: }

Defined functions

Defined variables

Defined macros