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Annotation of 43BSD/contrib/icon/link/llex.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Lexical analysis routines.
        !             3:  */
        !             4: 
        !             5: #include "ilink.h"
        !             6: #include "opcode.h"
        !             7: 
        !             8: static int nlflag = 0;         /* newline last seen */
        !             9: 
        !            10: /*
        !            11:  * getop - get an opcode from infile, return the opcode number (via
        !            12:  *  binary search of opcode table), and point id at the name of the opcode.
        !            13:  */
        !            14: getop(id)
        !            15: char **id;
        !            16:    {
        !            17:    register char *s;
        !            18:    register struct opentry *p;
        !            19:    register int test;
        !            20:    int low, high, cmp;
        !            21:    extern char *getstr();
        !            22: 
        !            23:    s = getstr();
        !            24:    if (s == NULL)
        !            25:       return (EOF);
        !            26:    low = 0;
        !            27:    high = NOPCODES;
        !            28:    do {
        !            29:       test = (low + high) / 2;
        !            30:       p = &optable[test];
        !            31:       if ((cmp = strcmp(p->op_name, s)) < 0)
        !            32:          low = test + 1;
        !            33:       else if (cmp > 0)
        !            34:          high = test;
        !            35:       else {
        !            36:          *id = p->op_name;
        !            37:          return (p->op_code);
        !            38:          }
        !            39:       } while (low < high);
        !            40:    *id = s;
        !            41:    return (NULL);
        !            42:    }
        !            43: 
        !            44: /*
        !            45:  * getid - get an identifier from infile, put it in the identifier
        !            46:  *  table, and return a pointer to it.
        !            47:  */
        !            48: char *getid()
        !            49:    {
        !            50:    register char *s;
        !            51:    extern char *getstr();
        !            52:    extern char *putident();
        !            53: 
        !            54:    s = getstr();
        !            55:    if (s == NULL)
        !            56:       return (NULL);
        !            57:    return (putident(strlen(s)+1));
        !            58:    }
        !            59: 
        !            60: /*
        !            61:  * getstr - get an identifier from infile and return a pointer to it.
        !            62:  */
        !            63: char *getstr()
        !            64:    {
        !            65:    register int c;
        !            66:    register char *p;
        !            67: 
        !            68:    p = sfree;
        !            69:    while ((c = getc(infile)) == ' ' || c == '\t') ;
        !            70:    if (c == EOF)
        !            71:       return (NULL);
        !            72:    while (c != ' ' && c != '\t' && c != '\n' && c != ',' && c != EOF) {
        !            73:       *p++ = c;
        !            74:       c = getc(infile);
        !            75:       }
        !            76:    *p = 0;
        !            77:    nlflag = (c == '\n');
        !            78:    return (sfree);
        !            79:    }
        !            80: 
        !            81: /*
        !            82:  * getdec - get a decimal integer from infile, and return it.
        !            83:  */
        !            84: getdec()
        !            85:    {
        !            86:    register int c, n;
        !            87: 
        !            88:    n = 0;
        !            89:    while ((c = getc(infile)) == ' ' || c == '\t') ;
        !            90:    if (c == EOF)
        !            91:       return (0);
        !            92:    while (c >= '0' && c <= '9') {
        !            93:       n = n * 10 + (c - '0');
        !            94:       c = getc(infile);
        !            95:       }
        !            96:    nlflag = (c == '\n');
        !            97:    return (n);
        !            98:    }
        !            99: 
        !           100: /*
        !           101:  * getoct - get an octal number from infile, and return it.
        !           102:  */
        !           103: getoct()
        !           104:    {
        !           105:    register int c, n;
        !           106: 
        !           107:    n = 0;
        !           108:    while ((c = getc(infile)) == ' ' || c == '\t') ;
        !           109:    if (c == EOF)
        !           110:       return (0);
        !           111:    while (c >= '0' && c <= '7') {
        !           112:       n = (n << 3) | (c - '0');
        !           113:       c = getc(infile);
        !           114:       }
        !           115:    nlflag = (c == '\n');
        !           116:    return (n);
        !           117:    }
        !           118: 
        !           119: /*
        !           120:  * getint - get an Icon integer from infile, and return it.
        !           121:  */
        !           122: long getint()
        !           123:    {
        !           124:    register c;
        !           125:    register int r;
        !           126:    long int n;
        !           127: 
        !           128:    n = 0L;
        !           129:    while ((c = getc(infile)) >= '0' && c <= '9')
        !           130:       n = n * 10 + (c - '0');
        !           131:    if (c == 'r' || c == 'R') {
        !           132:       r = n;
        !           133:       n = 0L;
        !           134:       while (c = getc(infile)) {
        !           135:          if (c >= '0' && c <= '9')
        !           136:             c -= '0';
        !           137:          else if (c >= 'a' && c <= 'z')
        !           138:             c -= 'a' - 10;
        !           139:          else if (c >= 'A' && c <= 'Z')
        !           140:             c -= 'A' - 10;
        !           141:          else
        !           142:             break;
        !           143:          n = n * r + c;
        !           144:          }
        !           145:       }
        !           146:    nlflag = (c == '\n');
        !           147:    return (n);
        !           148:    }
        !           149: 
        !           150: /*
        !           151:  * getreal - get an Icon real number from infile, and return it.
        !           152:  */
        !           153: double getreal()
        !           154:    {
        !           155:    double n;
        !           156:    register int c, d, e;
        !           157:    int esign;
        !           158:    static double tens[] = {
        !           159:       1.0e0,  1.0e1,  1.0e2,  1.0e3,  1.0e4,  1.0e5,
        !           160:       1.0e6,  1.0e7,  1.0e8,  1.0e9,  1.0e10, 1.0e11,
        !           161:       1.0e12, 1.0e13, 1.0e14, 1.0e15, 1.0e16, 1.0e17,
        !           162:       1.0e18, 1.0e19, 1.0e20, 1.0e21, 1.0e22, 1.0e23,
        !           163:       1.0e24, 1.0e25, 1.0e26, 1.0e27, 1.0e28, 1.0e29,
        !           164:       1.0e30, 1.0e31, 1.0e32, 1.0e33, 1.0e34, 1.0e35,
        !           165:       1.0e36, 1.0e37, 1.0e38
        !           166:       };
        !           167:    static double ntens[] = {
        !           168:       1.0e0,   1.0e-1,  1.0e-2,  1.0e-3,  1.0e-4,  1.0e-5,
        !           169:       1.0e-6,  1.0e-7,  1.0e-8,  1.0e-9,  1.0e-10, 1.0e-11,
        !           170:       1.0e-12, 1.0e-13, 1.0e-14, 1.0e-15, 1.0e-16, 1.0e-17,
        !           171:       1.0e-18, 1.0e-19, 1.0e-20, 1.0e-21, 1.0e-22, 1.0e-23,
        !           172:       1.0e-24, 1.0e-25, 1.0e-26, 1.0e-27, 1.0e-28, 1.0e-29,
        !           173:       1.0e-30, 1.0e-31, 1.0e-32, 1.0e-33, 1.0e-34, 1.0e-35,
        !           174:       1.0e-36, 1.0e-37, 1.0e-38
        !           175:       };
        !           176: 
        !           177:    n = 0.0;
        !           178:    d = e = 0;
        !           179:    esign = 1;
        !           180:    while ((c = getc(infile)) >= '0' && c <= '9')
        !           181:       n = n * 10 + (c - '0');
        !           182:    if (c == '.') {
        !           183:       while ((c = getc(infile)) >= '0' && c <= '9') {
        !           184:          n = n * 10 + (c - '0');
        !           185:          d++;
        !           186:          }
        !           187:       }
        !           188:    if (c == 'e' || c == 'E') {
        !           189:       if ((c = getc(infile)) == '+' || c == '-') {
        !           190:          if (c == '-')
        !           191:             esign = -1;
        !           192:          c = getc(infile);
        !           193:          }
        !           194:       while (c >= '0' && c <= '9') {
        !           195:          e = e * 10 + (c - '0');
        !           196:          c = getc(infile);
        !           197:          }
        !           198:       }
        !           199:    if (esign < 0)
        !           200:       e = -e;
        !           201:    e = e - d;
        !           202:    if (e >= -38 && e < 0)
        !           203:       n = n * ntens[-e];
        !           204:    else if (e > 0 && e <= 38)
        !           205:       n = n * tens[e];
        !           206:    nlflag = (c == '\n');
        !           207:    return (n);
        !           208:    }
        !           209: 
        !           210: /*
        !           211:  * getlab - get a label ("L" followed by a number) from infile,
        !           212:  *  and return the number.
        !           213:  */
        !           214: 
        !           215: getlab()
        !           216:    {
        !           217:    register int c;
        !           218: 
        !           219:    while ((c = getc(infile)) != 'L' && c != EOF && c != '\n') ;
        !           220:    if (c == 'L')
        !           221:       return (getdec());
        !           222:    nlflag = (c == '\n');
        !           223:    return (0);
        !           224:    }
        !           225: 
        !           226: /*
        !           227:  * getstrlit - get a string literal from infile, as a string
        !           228:  *  of octal bytes, and return it.
        !           229:  */
        !           230: char *getstrlit(l)
        !           231: register int l;
        !           232:    {
        !           233:    register char *p;
        !           234:    extern char *putident();
        !           235: 
        !           236:    p = sfree;
        !           237:    while (!nlflag && l--)
        !           238:       *p++ = getoct();
        !           239:    *p++ = 0;
        !           240:    return (putident(p-sfree));
        !           241:    }
        !           242: 
        !           243: /*
        !           244:  * newline - skip to next line.
        !           245:  */
        !           246: newline()
        !           247:    {
        !           248:    register int c;
        !           249: 
        !           250:    if (!nlflag) {
        !           251:       while ((c = getc(infile)) != '\n' && c != EOF) ;
        !           252:       }
        !           253:    nlflag = 0;
        !           254:    }

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