Detect a few more inconsistencies

[ypp-sc-tools.web-live.git] / pctb / common.c

diff --git a/pctb/common.c b/pctb/common.c
index 3cb4323151c86cbc46a0c80cfe73241537e253ac..f95e585866657f8d8e29c19c7c31b5daeae9c977 100644 (file)
--- a/pctb/common.c
+++ b/pctb/common.c
@@ -42,17 +42,37 @@ void *mrealloc(void *p, size_t sz) {
 
 
 FILE *dbfile;
-static const char *path;
+static const char *basepath; /* as passed in by caller */
+static pid_t dbzcat;
+
+int dbfile_gzopen(const char *basepath_spec) {
+  assert(!dbfile);
+
+  basepath= basepath_spec;
+
+  char *zpath= masprintf("%s.gz", basepath);
+  int e= gzopen(zpath, O_RDONLY, &dbfile, &dbzcat, 0);
+  free(zpath);
+  if (e) { errno=e; sysassert(errno==ENOENT); return 0; }
+  
+  return 1;
+}  
 
 int dbfile_open(const char *tpath) {
   assert(!dbfile);
-  path= tpath;
-  dbfile= fopen(path,"r");
-  if (dbfile) return 1;
-  sysassert(errno==ENOENT);
-  return 0;
+
+  basepath= tpath;
+
+  dbzcat= -1;
+  dbfile= fopen(tpath,"r");
+  if (!dbfile) { sysassert(errno==ENOENT); return 0; }
+  return 1;
 }  
 
+void dbfile_close(void) {
+  gzclose(&dbfile, &dbzcat, basepath);
+}
+
 #define dbassertgl(x) ((x) ? (void)0 : dbfile_assertfail(file,line,#x))
 
 void dbfile_getsline(char *lbuf, size_t lbufsz, const char *file, int line) {
@@ -66,13 +86,6 @@ void dbfile_getsline(char *lbuf, size_t lbufsz, const char *file, int line) {
   lbuf[l]= 0;
 }
 
-void dbfile_close(void) {
-  if (!dbfile) return;
-  sysassert(!ferror(dbfile));
-  sysassert(!fclose(dbfile));
-  dbfile= 0;
-}
-
 int dbfile_vscanf(const char *fmt, va_list al) {
   int r= vfscanf(dbfile,fmt,al);
   sysassert(!ferror(dbfile));
@@ -88,8 +101,68 @@ int dbfile_scanf(const char *fmt, ...) {
 }
 
 void dbfile_assertfail(const char *file, int line, const char *m) {
-  fatal("Error in database file %s at byte %ld:\n"
-       " Requirement not met at %s:%d:\n"
-       " %s",
-       path,(long)ftell(dbfile), file,line, m);
+  if (dbzcat)
+    fatal("Error in dictionary file %s.gz:\n"
+         " Requirement not met at %s:%d:\n"
+         " %s",
+         basepath, file,line, m);
+  else if (dbfile)
+    fatal("Error in dictionary file %s at byte %ld:\n"
+         " Requirement not met at %s:%d:\n"
+         " %s",
+         basepath,(long)ftell(dbfile), file,line, m);
+  else
+    fatal("Semantic error in dictionaries:\n"
+         " Requirement not met at %s:%d:\n"
+         " %s",
+         file,line, m);
+}
+
+int gzopen(const char *zpath, int oflags, FILE **f_r, pid_t *pid_r,
+          const char *gziplevel /* 0 for read; may be 0, or "-1" etc. */) {
+
+  int zfd= open(zpath, oflags, 0666);
+  if (!zfd) return errno;
+
+  int pipefds[2];
+  sysassert(! pipe(pipefds) );
+
+  int oi,io; const char *cmd; const char *stdiomode;
+  switch ((oflags & O_ACCMODE)) {
+  case O_RDONLY: oi=0; io=1; cmd="gunzip"; stdiomode="r"; break;
+  case O_WRONLY: oi=1; io=0; cmd="gzip";   stdiomode="w"; break;
+  default: abort();
+  }
+
+  sysassert( (*pid_r=fork()) != -1 );
+  if (!*pid_r) {
+    sysassert( dup2(zfd,oi)==oi );
+    sysassert( dup2(pipefds[io],io)==io );
+    sysassert(! close(zfd) );
+    sysassert(! close(pipefds[0]) );
+    sysassert(! close(pipefds[1]) );
+    execlp(cmd,cmd,gziplevel,(char*)0);
+    sysassert(!"execlp gzip/gunzip");
+  }
+  sysassert(! close(zfd) );
+  sysassert(! close(pipefds[io]) );
+  sysassert( *f_r= fdopen(pipefds[oi], stdiomode) );
+
+  return 0;
+}
+
+void gzclose(FILE **f, pid_t *p, const char *what) {
+  if (!*f) return;
+  
+  sysassert(!ferror(*f));
+  sysassert(!fclose(*f));
+
+  if (*p != -1) {
+    char *process= masprintf("%s (de)compressor",what);
+    waitpid_check_exitstatus(*p,process,1);
+    free(process);
+    *p= -1;
+  }
+
+  *f= 0;
 }