golang.org/x/exp@v0.0.0-20240506185415-9bf2ced13842/shootout/reverse-complement.c (about)

     1  // +build ignore
     2  
     3  /*
     4  Redistribution and use in source and binary forms, with or without
     5  modification, are permitted provided that the following conditions are met:
     6  
     7      * Redistributions of source code must retain the above copyright
     8      notice, this list of conditions and the following disclaimer.
     9  
    10      * Redistributions in binary form must reproduce the above copyright
    11      notice, this list of conditions and the following disclaimer in the
    12      documentation and/or other materials provided with the distribution.
    13  
    14      * Neither the name of "The Computer Language Benchmarks Game" nor the
    15      name of "The Computer Language Shootout Benchmarks" nor the names of
    16      its contributors may be used to endorse or promote products derived
    17      from this software without specific prior written permission.
    18  
    19  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    20  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    21  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    22  ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    23  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    24  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    25  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    26  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    27  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    28  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    29  POSSIBILITY OF SUCH DAMAGE.
    30  */
    31  
    32  /*
    33   * The Computer Language Benchmarks Game
    34   * http://shootout.alioth.debian.org
    35   *
    36   * contributed by Bob W
    37   */
    38  
    39  #include <stdio.h>
    40  #include <stdlib.h>
    41  
    42  #define JBFSIZE 82      // line input buffer size
    43  #define QBFSIZE 5200     // output buffer initial size
    44  #define Z16     "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
    45  #define V32     "\0TVGH\0\0CD\0\0M\0KN\0\0\0YSA\0BW\0R\0\0\0\0\0\0"
    46  #define VALL    Z16 Z16 Z16 Z16 V32 V32 Z16 Z16 Z16 Z16 Z16 Z16 Z16 Z16
    47  
    48  int errex(char *s, int n) {      // error message+value, return 1
    49    fprintf(stderr,"\n*** Error: %s [%d]!\n", s, n);
    50    return 1;
    51  }
    52  
    53  int main () {                    // ***** main *****
    54    char *pj, *pq, *pr;            // buffer pointers: inp,out,/out
    55    char *jjj = malloc(JBFSIZE);   // allocate input line buffer
    56    char *qqq = malloc(QBFSIZE);   // output buffer (dyn. size)
    57    char *pqstop = qqq+QBFSIZE;    // end-of-buffer pointer
    58    char xtab[256] = VALL;         // char conversion table
    59  
    60    if (!jjj || !qqq)
    61      return errex("Buffer allocation", !jjj + !qqq);
    62    pj = fgets(jjj,JBFSIZE,stdin);         // fetch 1st line
    63    if (!pj)
    64      return errex("No input data",0);
    65    if (*jjj != '>')
    66      return errex("1st char not '>'", 0);
    67  
    68    while (pj) {                           // MAIN LOOP: process data
    69      fputs(jjj, stdout);                  // output ID line
    70  
    71      for (pq=qqq+1, pr=pqstop; ; pq++) {  // LOOP: fill output buffer
    72        pj = fgets(jjj, JBFSIZE, stdin);   // get line from stdin
    73        if (!pj || (*jjj=='>'))  break;    // EOF or new ID line
    74        if (pr <= (pq+61)) {               // need to resize buffer
    75          char *newstop = pqstop + 12777888;
    76          char *newptr  = realloc(qqq, newstop-qqq);
    77          if (!newptr)
    78            return errex("Out of memory", 0);
    79          if (newptr != qqq) {             // new base: adj. pointers
    80            size_t x = newptr-qqq;         // offset for pointer update
    81            pq+=x;  pr+=x;  qqq+=x;
    82            newstop+=x;  pqstop+=x;
    83          }
    84          pr = __builtin_memmove(newstop-(pqstop-pr), pr, pqstop-pr);
    85          pqstop = newstop;                // buffer resize complete
    86        }
    87        while (*pj) {                      // LOOP: conv. & revert line
    88          char c = xtab[(unsigned char)(*pj++)];
    89          if (c)                           // conversion valid
    90            *(--pr) = c;
    91        }
    92      }
    93  
    94      for (pq = qqq; pr<pqstop; ) {        // LOOP: format output
    95        size_t x = (pqstop-pr)<60 ? pqstop-pr : 60;
    96        __builtin_memmove(pq,pr,x);        // move line to free space
    97        pr+=x;  pq+=x;  *(pq++) = 0xA;     // adjust pointers, add LF
    98      }
    99      fwrite(qqq, 1, pq-qqq, stdout);      // output converted data
   100    }
   101    return 0;
   102  }