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- #include "stralloc.h"
- #include "str.h"
- #include "quote.h"
-
- /*
- quote() encodes a box as per rfc 821 and rfc 822,
- while trying to do as little quoting as possible.
- no, 821 and 822 don't have the same encoding. they're not even close.
- no special encoding here for bytes above 127.
- */
-
- static char ok[128] = {
- 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
- ,0,7,0,7,7,7,7,7,0,0,7,7,0,7,7,7 ,7,7,7,7,7,7,7,7,7,7,0,0,0,7,0,7
- ,0,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 ,7,7,7,7,7,7,7,7,7,7,7,0,0,0,7,7
- ,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 ,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,0
- } ;
-
- static int doit(saout,sain)
- stralloc *saout;
- stralloc *sain;
- {
- char ch;
- int i;
- int j;
-
- if (!stralloc_ready(saout,sain->len * 2 + 2)) return 0;
- j = 0;
- saout->s[j++] = '"';
- for (i = 0;i < sain->len;++i)
- {
- ch = sain->s[i];
- if ((ch == '\r') || (ch == '\n') || (ch == '"') || (ch == '\\'))
- saout->s[j++] = '\\';
- saout->s[j++] = ch;
- }
- saout->s[j++] = '"';
- saout->len = j;
- return 1;
- }
-
- int quote_need(s,n)
- char *s;
- unsigned int n;
- {
- unsigned char uch;
- int i;
- if (!n) return 0;
- for (i = 0;i < n;++i)
- {
- uch = s[i];
- if (uch >= 128) return 1;
- if (!ok[uch]) return 1;
- }
- if (s[0] == '.') return 1;
- if (s[n - 1] == '.') return 1;
- for (i = 0;i < n - 1;++i) if (s[i] == '.') if (s[i + 1] == '.') return 1;
- return 0;
- }
-
- int quote(saout,sain)
- stralloc *saout;
- stralloc *sain;
- {
- if (quote_need(sain->s,sain->len)) return doit(saout,sain);
- return stralloc_copy(saout,sain);
- }
-
- static stralloc foo = {0};
-
- int quote2(sa,s)
- stralloc *sa;
- char *s;
- {
- int j;
- j = str_rchr(s,'@');
- if (!stralloc_copys(&foo,s)) return 0;
- if (!s[j]) return quote(sa,&foo);
- foo.len = j;
- if (!quote(sa,&foo)) return 0;
- return stralloc_cats(sa,s + j);
- }
-