| Revision 12455,
1.3 KB
checked in by danw, 26 years ago
(diff) |
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This commit was generated by cvs2svn to compensate for changes in r12454,
which included commits to RCS files with non-trunk default branches.
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| 1 | |
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| 2 | /* |
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| 3 | * vfgets.c -- virtual fgets |
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| 4 | * |
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| 5 | * $Id: vfgets.c,v 1.1.1.1 1999-02-07 18:14:10 danw Exp $ |
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| 6 | */ |
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| 7 | |
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| 8 | #include <h/mh.h> |
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| 9 | |
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| 10 | #define QUOTE '\\' |
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| 11 | |
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| 12 | |
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| 13 | int |
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| 14 | vfgets (FILE *in, char **bp) |
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| 15 | { |
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| 16 | int toggle; |
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| 17 | char *cp, *dp, *ep, *fp; |
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| 18 | static int len = 0; |
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| 19 | static char *pp = NULL; |
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| 20 | |
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| 21 | if (pp == NULL) |
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| 22 | if (!(pp = malloc ((size_t) (len = BUFSIZ)))) |
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| 23 | adios (NULL, "unable to allocate string storage"); |
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| 24 | |
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| 25 | for (ep = (cp = pp) + len - 1;;) { |
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| 26 | if (fgets (cp, ep - cp + 1, in) == NULL) { |
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| 27 | if (cp != pp) { |
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| 28 | *bp = pp; |
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| 29 | return 0; |
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| 30 | } |
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| 31 | return (ferror (in) && !feof (in) ? -1 : 1); |
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| 32 | } |
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| 33 | |
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| 34 | if ((dp = cp + strlen (cp) - 2) < cp || *dp != QUOTE) { |
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| 35 | wrong_guess: |
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| 36 | if (cp > ++dp) |
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| 37 | adios (NULL, "vfgets() botch -- you lose big"); |
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| 38 | if (*dp == '\n') { |
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| 39 | *bp = pp; |
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| 40 | return 0; |
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| 41 | } else { |
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| 42 | cp = ++dp; |
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| 43 | } |
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| 44 | } else { |
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| 45 | for (fp = dp - 1, toggle = 0; fp >= cp; fp--) { |
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| 46 | if (*fp != QUOTE) |
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| 47 | break; |
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| 48 | else |
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| 49 | toggle = !toggle; |
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| 50 | } |
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| 51 | if (toggle) |
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| 52 | goto wrong_guess; |
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| 53 | |
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| 54 | if (*++dp == '\n') { |
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| 55 | *--dp = 0; |
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| 56 | cp = dp; |
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| 57 | } else { |
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| 58 | cp = ++dp; |
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| 59 | } |
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| 60 | } |
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| 61 | |
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| 62 | if (cp >= ep) { |
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| 63 | int curlen = cp - pp; |
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| 64 | |
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| 65 | if (!(dp = realloc (pp, (size_t) (len += BUFSIZ)))) { |
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| 66 | adios (NULL, "unable to allocate string storage"); |
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| 67 | } else { |
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| 68 | cp = dp + curlen; |
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| 69 | ep = (pp = dp) + len - 1; |
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| 70 | } |
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| 71 | } |
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| 72 | } |
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| 73 | } |
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