mdw@git.distorted.org.uk Git - cparse/blob - parse.c

   1 #include "cparse.h"
   2 #include <sys/types.h>
   3 #include <unistd.h>
   4 #include <sys/wait.h>
   5
   6 static const char *cpp = "cc";
   7 static const char **options;
   8 static int noptions = 2;
   9
  10 static void cc_option(const char *s) {
  11   options = xrealloc(options, ++noptions * sizeof(char *));
  12   options[noptions - 1] = s;
  13 }
  14
  15 int commandline(int argc, char **argv) {
  16   int n = 1;
  17
  18   yy_flex_debug = 0;
  19   while(n < argc && strcmp(argv[n], "--")) {
  20     if(!strcmp(argv[n], "--cpp") && n + 1 < argc)
  21       cpp = argv[++n];
  22     else if(!strcmp(argv[n], "--no-cpp"))
  23       cpp = 0;
  24     else if(!strcmp(argv[n], "--yydebug"))
  25       yydebug = 1;
  26     else if(!strcmp(argv[n], "--flexdebug"))
  27       yy_flex_debug = 1;
  28     else
  29       cc_option(argv[n]);
  30     ++n;
  31   }
  32   if(n < argc)
  33     ++n;
  34   return n;
  35 }
  36
  37 struct external_declaration *parse(const char *filename) {
  38   FILE *fp;
  39   pid_t pid = -1, r;
  40   int p[2], w;
  41   struct external_declaration *tu;
  42
  43   if(cpp) {
  44     if(pipe(p) < 0) fatal(errno, "pipe");
  45     if((pid = fork()) < 0) fatal(errno, "fork");
  46     if(!pid) {
  47       exiter = _exit;
  48       if(close(p[0]) < 0) fatal(errno, "close");
  49       if(p[1] != 1) {
  50         if(dup2(p[1], 1) < 0) fatal(errno, "dup2");
  51         if(close(p[1]) < 0) fatal(errno, "close");
  52       }
  53       cc_option(filename);
  54       cc_option(0);
  55       options[0] = cpp;
  56       options[1] = "-E";
  57       execvp(options[0], (char **)options);
  58       fatal(errno, "execve %s", cpp);
  59     }
  60     if(close(p[1]) < 0) fatal(errno, "close");
  61     if(!(fp = fdopen(p[0], "r"))) fatal(errno, "fdopen");
  62   } else
  63     if(!(fp = fopen(filename, "r"))) fatal(errno, "opening %s", filename);
  64   parser_init(fp);
  65   yyparse();
  66   yyin = 0;
  67   if(fclose(fp) < 0) fatal(errno, "fclose");
  68   if(cpp) {
  69     while((r = waitpid(pid, &w, 0)) < 0 && errno == EINTR)
  70       ;
  71     if(r < 0) fatal(errno, "waitpid");
  72     if(w) fatal(0, "%s exited with status %d", cpp, w);
  73   }
  74   tu = translation_unit;
  75   translation_unit = 0;
  76   return tu;
  77 }
  78
  79 /*
  80 Local Variables:
  81 c-basic-offset:2
  82 comment-column:40
  83 End:
  84 */