Function shell_callback

lib-src/sqlite/shell.c:12140–12501

** This is the callback routine that the shell ** invokes for each row of a query result. */

** invokes for each row of a query result.
*/
static int shell_callback(
  void *pArg,
  int nArg,        /* Number of result columns */
  char **azArg,    /* Text of each result column */
  char **azCol,    /* Column names */
  int *aiType      /* Column types.  Might be NULL */
){
  int i;
  ShellState *p = (ShellState*)pArg;

  if( azArg==0 ) return 0;
  switch( p->cMode ){
    case MODE_Line: {
      int w = 5;
      if( azArg==0 ) break;
      for(i=0; i<nArg; i++){
        int len = strlen30(azCol[i] ? azCol[i] : "");
        if( len>w ) w = len;
      }
      if( p->cnt++>0 ) utf8_printf(p->out, "%s", p->rowSeparator);
      for(i=0; i<nArg; i++){
        utf8_printf(p->out,"%*s = %s%s", w, azCol[i],
                azArg[i] ? azArg[i] : p->nullValue, p->rowSeparator);
      }
      break;
    }
    case MODE_Explain: {
      static const int aExplainWidth[] = {4, 13, 4, 4, 4, 13, 2, 13};
      if( nArg>ArraySize(aExplainWidth) ){
        nArg = ArraySize(aExplainWidth);
      }
      if( p->cnt++==0 ){
        for(i=0; i<nArg; i++){
          int w = aExplainWidth[i];
          utf8_width_print(p->out, w, azCol[i]);
          fputs(i==nArg-1 ? "\n" : "  ", p->out);
        }
        for(i=0; i<nArg; i++){
          int w = aExplainWidth[i];
          print_dashes(p->out, w);
          fputs(i==nArg-1 ? "\n" : "  ", p->out);
        }
      }
      if( azArg==0 ) break;
      for(i=0; i<nArg; i++){
        int w = aExplainWidth[i];
        if( i==nArg-1 ) w = 0;
        if( azArg[i] && strlenChar(azArg[i])>w ){
          w = strlenChar(azArg[i]);
        }
        if( i==1 && p->aiIndent && p->pStmt ){
          if( p->iIndent<p->nIndent ){
            utf8_printf(p->out, "%*.s", p->aiIndent[p->iIndent], "");
          }
          p->iIndent++;
        }
        utf8_width_print(p->out, w, azArg[i] ? azArg[i] : p->nullValue);
        fputs(i==nArg-1 ? "\n" : "  ", p->out);