| 1 | #include "stralloc.h" |
| 2 | #include "str.h" |
| 3 | #include "quote.h" |
| 4 | |
| 5 | /* |
| 6 | quote() encodes a box as per rfc 821 and rfc 822, |
| 7 | while trying to do as little quoting as possible. |
| 8 | no, 821 and 822 don't have the same encoding. they're not even close. |
| 9 | no special encoding here for bytes above 127. |
| 10 | */ |
| 11 | |
| 12 | static char ok[128] = { |
| 13 | 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 |
| 14 | ,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 |
| 15 | ,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 |
| 16 | ,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 |
| 17 | } ; |
| 18 | |
| 19 | static int doit(saout,sain) |
| 20 | stralloc *saout; |
| 21 | stralloc *sain; |
| 22 | { |
| 23 | char ch; |
| 24 | int i; |
| 25 | int j; |
| 26 | |
| 27 | if (!stralloc_ready(saout,sain->len * 2 + 2)) return 0; |
| 28 | j = 0; |
| 29 | saout->s[j++] = '"'; |
| 30 | for (i = 0;i < sain->len;++i) |
| 31 | { |
| 32 | ch = sain->s[i]; |
| 33 | if ((ch == '\r') || (ch == '\n') || (ch == '"') || (ch == '\\')) |
| 34 | saout->s[j++] = '\\'; |
| 35 | saout->s[j++] = ch; |
| 36 | } |
| 37 | saout->s[j++] = '"'; |
| 38 | saout->len = j; |
| 39 | return 1; |
| 40 | } |
| 41 | |
| 42 | int quote_need(s,n) |
| 43 | char *s; |
| 44 | unsigned int n; |
| 45 | { |
| 46 | unsigned char uch; |
| 47 | int i; |
| 48 | if (!n) return 1; |
| 49 | for (i = 0;i < n;++i) |
| 50 | { |
| 51 | uch = s[i]; |
| 52 | if (uch >= 128) return 1; |
| 53 | if (!ok[uch]) return 1; |
| 54 | } |
| 55 | if (s[0] == '.') return 1; |
| 56 | if (s[n - 1] == '.') return 1; |
| 57 | for (i = 0;i < n - 1;++i) if (s[i] == '.') if (s[i + 1] == '.') return 1; |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | int quote(saout,sain) |
| 62 | stralloc *saout; |
| 63 | stralloc *sain; |
| 64 | { |
| 65 | if (quote_need(sain->s,sain->len)) return doit(saout,sain); |
| 66 | return stralloc_copy(saout,sain); |
| 67 | } |
| 68 | |
| 69 | static stralloc foo = {0}; |
| 70 | |
| 71 | int quote2(sa,s) |
| 72 | stralloc *sa; |
| 73 | char *s; |
| 74 | { |
| 75 | int j; |
| 76 | if (!*s) return stralloc_copys(sa,s); |
| 77 | j = str_rchr(s,'@'); |
| 78 | if (!stralloc_copys(&foo,s)) return 0; |
| 79 | if (!s[j]) return quote(sa,&foo); |
| 80 | foo.len = j; |
| 81 | if (!quote(sa,&foo)) return 0; |
| 82 | return stralloc_cats(sa,s + j); |
| 83 | } |