metadata as tsv text header means we don't care about = in values

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

diff --git a/pctb/common.c b/pctb/common.c
index 7fa5b44bc6b393a922ee8ea8db120b7fec377205..f95e585866657f8d8e29c19c7c31b5daeae9c977 100644 (file)
--- a/pctb/common.c
+++ b/pctb/common.c
@@ -27,22 +27,6 @@
 
 #include "common.h"
 
-#define dbassert(x)                                                    \
-  ((x) ? (void)0 :                                                     \
-     fatal("Error in database.\n"                                      \
-          " Requirement not met: %s:%d: %s", __FILE__,__LINE__, #x))
-
-void fgetsline(FILE *f, char *lbuf, size_t lbufsz) {
-  errno=0;
-  char *s= fgets(lbuf,lbufsz,f);
-  sysassert(!ferror(f));
-  dbassert(!feof(f));
-  assert(s);
-  int l= strlen(lbuf);
-  dbassert(l>0);  dbassert(lbuf[--l]='\n');
-  lbuf[l]= 0;
-}
-
 void *mmalloc(size_t sz) {
   void *r;
   if (!sz) return 0;
@@ -55,3 +39,130 @@ void *mrealloc(void *p, size_t sz) {
   sysassert( r= realloc(p,sz) );
   return r;
 }
+
+
+FILE *dbfile;
+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);
+
+  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) {
+  errno=0;
+  char *s= fgets(lbuf,lbufsz,dbfile);
+  sysassert(!ferror(dbfile));
+  dbassertgl(!feof(dbfile));
+  assert(s);
+  int l= strlen(lbuf);
+  dbassertgl(l>0);  dbassertgl(lbuf[--l]=='\n');
+  lbuf[l]= 0;
+}
+
+int dbfile_vscanf(const char *fmt, va_list al) {
+  int r= vfscanf(dbfile,fmt,al);
+  sysassert(!ferror(dbfile));
+  return r;
+}
+
+int dbfile_scanf(const char *fmt, ...) {
+  va_list al;
+  va_start(al,fmt);
+  int r= dbfile_vscanf(fmt,al);
+  va_end(al);
+  return r;
+}
+
+void dbfile_assertfail(const char *file, int line, const char *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;
+}