projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 2ae9f53f SL |
1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)strings.c 2.2 (Berkeley) %G%"; | |
| 3 | #endif | |
| 563238c6 KS |
4 | |
| 5 | /* | |
| 6 | * Mail -- a mail program | |
| 7 | * | |
| 8 | * String allocation routines. | |
| 9 | * Strings handed out here are reclaimed at the top of the command | |
| 10 | * loop each time, so they need not be freed. | |
| 11 | */ | |
| 12 | ||
| 13 | #include "rcv.h" | |
| 14 | ||
| 563238c6 KS |
15 | /* |
| 16 | * Allocate size more bytes of space and return the address of the | |
| 17 | * first byte to the caller. An even number of bytes are always | |
| 18 | * allocated so that the space will always be on a word boundary. | |
| 19 | * The string spaces are of exponentially increasing size, to satisfy | |
| 20 | * the occasional user with enormous string size requests. | |
| 21 | */ | |
| 22 | ||
| 23 | char * | |
| 24 | salloc(size) | |
| 25 | { | |
| 26 | register char *t; | |
| 27 | register int s; | |
| 28 | register struct strings *sp; | |
| 29 | int index; | |
| 30 | ||
| 31 | s = size; | |
| 32 | s++; | |
| 33 | s &= ~01; | |
| 34 | index = 0; | |
| 35 | for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { | |
| 36 | if (sp->s_topFree == NOSTR && (STRINGSIZE << index) >= s) | |
| 37 | break; | |
| 38 | if (sp->s_nleft >= s) | |
| 39 | break; | |
| 40 | index++; | |
| 41 | } | |
| 42 | if (sp >= &stringdope[NSPACE]) | |
| 43 | panic("String too large"); | |
| 44 | if (sp->s_topFree == NOSTR) { | |
| 45 | index = sp - &stringdope[0]; | |
| 46 | sp->s_topFree = (char *) calloc(STRINGSIZE << index, | |
| 47 | (unsigned) 1); | |
| 48 | if (sp->s_topFree == NOSTR) { | |
| 49 | fprintf(stderr, "No room for space %d\n", index); | |
| 50 | panic("Internal error"); | |
| 51 | } | |
| 52 | sp->s_nextFree = sp->s_topFree; | |
| 53 | sp->s_nleft = STRINGSIZE << index; | |
| 54 | } | |
| 55 | sp->s_nleft -= s; | |
| 56 | t = sp->s_nextFree; | |
| 57 | sp->s_nextFree += s; | |
| 58 | return(t); | |
| 59 | } | |
| 60 | ||
| 61 | /* | |
| 62 | * Reset the string area to be empty. | |
| 63 | * Called to free all strings allocated | |
| 64 | * since last reset. | |
| 65 | */ | |
| 66 | ||
| 67 | sreset() | |
| 68 | { | |
| 69 | register struct strings *sp; | |
| 70 | register int index; | |
| 71 | ||
| 72 | if (noreset) | |
| 73 | return; | |
| 74 | minit(); | |
| 75 | index = 0; | |
| 76 | for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { | |
| 77 | if (sp->s_topFree == NOSTR) | |
| 78 | continue; | |
| 79 | sp->s_nextFree = sp->s_topFree; | |
| 80 | sp->s_nleft = STRINGSIZE << index; | |
| 81 | index++; | |
| 82 | } | |
| 83 | } |