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Overview
Comment:Clarification of the StrAppend() routine in althttpd.c.
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SHA3-256: 90fe325e31755a0c920e0dba11fb9777879cfb30e3676e65836f1b5ebbd947fa
User & Date: drh 2019-02-18 15:22:33.098
Context
2019-02-18
15:33
Change "the following three queries" to "the following four queries" in fts5.in. (check-in: b5b65a3c13 user: dan tags: trunk)
15:22
Clarification of the StrAppend() routine in althttpd.c. (check-in: 90fe325e31 user: drh tags: trunk)
2019-02-16
16:42
Extra defensive coding in althttpd.c. (check-in: 2ae41f4427 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to misc/althttpd.c.
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  zDest = (char*)SafeMalloc( size );
  strcpy(zDest,zSrc);
  return zDest;
}
static char *StrAppend(char *zPrior, const char *zSep, const char *zSrc){
  char *zDest;
  size_t size;
  int n1, n2;

  if( zSrc==0 ) return 0;
  if( zPrior==0 ) return StrDup(zSrc);
  size = (n1=strlen(zSrc)) + (n2=strlen(zSep)) + strlen(zPrior) + 1;



  zDest = (char*)SafeMalloc( size );
  strcpy(zDest,zPrior);
  free(zPrior);
  strcpy(&zDest[n1],zSep);
  strcpy(&zDest[n1+n2],zSrc);
  return zDest;
}

/*
** Compare two ETag values. Return 0 if they match and non-zero if they differ.
**
** The one on the left might be a NULL pointer and it might be quoted.








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  zDest = (char*)SafeMalloc( size );
  strcpy(zDest,zSrc);
  return zDest;
}
static char *StrAppend(char *zPrior, const char *zSep, const char *zSrc){
  char *zDest;
  size_t size;
  size_t n0, n1, n2;

  if( zSrc==0 ) return 0;
  if( zPrior==0 ) return StrDup(zSrc);
  n0 = strlen(zPrior);
  n1 = strlen(zSep);
  n2 = strlen(zSrc);
  size = n0+n1+n2+1;
  zDest = (char*)SafeMalloc( size );
  memcpy(zDest, zPrior, n0);
  free(zPrior);
  memcpy(&zDest[n0],zSep,n1);
  memcpy(&zDest[n0+n1],zSrc,n2+1);
  return zDest;
}

/*
** Compare two ETag values. Return 0 if they match and non-zero if they differ.
**
** The one on the left might be a NULL pointer and it might be quoted.
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