m_getfld2: Return line for LENERR2, plus some documentation

diff --git a/sbr/m_getfld2.c b/sbr/m_getfld2.c
index 5920425..6d96bdd 100644 (file)
--- a/sbr/m_getfld2.c
+++ b/sbr/m_getfld2.c
@@ -26,8 +26,18 @@ static size_t copyname(char *, char *);
 
 
 /*
-** For the states FLD2, BODY2 and FMTERR2 memory is allocated for f->value.
-** For the states LENERR2, IOERR2 and FILEEOF2 no memory is allocated.
+** FLD2:       We read a (complete) header field
+** BODY2:      We read a body line
+** LENERR2:    Line is too long (>998, as defined by RFC 822)
+** FMTERR2:    Header field invalid
+** IOERR2:     Failure to read
+** FILEEOF2:   We're at the end of the file
+**
+** f->name is only filled in FLD2.
+**
+** In FLD2, f->value contains the field's (complete) value only;
+** in BODY2, LENERR2 and FMTERR2 f->value contains the whole line;
+** in IOERR2 and FILEEOF2 f->value is not set.
 */
 enum state
 m_getfld2(enum state s, struct field *f, FILE *msg)
@@ -46,14 +56,18 @@ m_getfld2(enum state s, struct field *f, FILE *msg)
                }
        }
 
+       *f->name = '\0';
+       f->namelen = 0;
+
        if (nchars >= NAMESZ) {
-               free(tmpline);
+               if (f->value) {
+                       free(f->value);
+               }
+               f->value = tmpline;
+               f->valuelen = nchars;
                return LENERR2;
        }
 
-       *f->name = '\0';
-       f->namelen = 0;
-
        switch (s) {
        case FLD2:
                if (*(tmpline + nchars - 1) != '\n') {
@@ -99,7 +113,11 @@ m_getfld2(enum state s, struct field *f, FILE *msg)
                        }
 
                        if (nchars >= NAMESZ) {
-                               free(tmpline);
+                               if (f->value) {
+                                       free(f->value);
+                               }
+                               f->value = tmpline;
+                               f->valuelen = nchars;
                                return LENERR2;
                        }