| 1 | #if defined(LIBC_SCCS) && !defined(lint) |
| 2 | static char sccsid[] = "@(#)vfscanf.c 5.2 (Berkeley) %G%"; |
| 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 | } |