github.com/sean-/go@v0.0.0-20151219100004-97f854cd7bb6/test/bench/shootout/reverse-complement.c (about)

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