diff options
Diffstat (limited to 'src/librarian.c')
| -rw-r--r-- | src/librarian.c | 110 |
1 files changed, 108 insertions, 2 deletions
diff --git a/src/librarian.c b/src/librarian.c index 0ebdf3a..2b21b39 100644 --- a/src/librarian.c +++ b/src/librarian.c @@ -49,13 +49,13 @@ struct library { * The lowest acceptable version. * `NULL` if unbounded. */ - const char *lower; + char *lower; /** * The highest acceptable version. * `NULL` if unbounded. */ - const char *upper; + char *upper; /** * Is the version stored in @@ -148,6 +148,110 @@ static int parse_library(char *s, struct library *lib) /** + * Compare two version numbers that do not + * compare any does, and does not have an + * epoch. + * + * @param a One of the version numbers. + * @param b The other version number. + * @return <0: `a` < `b`. + * =0: `a` = `b`. + * >1: `a` > `b`. + */ +static int version_subcmp(char *a, char *b) +{ + char *ap; + char *bp; + char ac, bc; + int r; + + while (*a || *b) { + /* Compare digit part. */ + /* (We must support arbitrary lenght.) */ + ap = a + strspn(a, "0123456789"); + bp = b + strspn(b, "0123456789"); + while (*a == '0') a++; + while (*b == '0') b++; + ac = *ap, bc = *bp; + *ap = '\0', *bp = '\0'; + if (ap - a < bp - b) return -1; + if (ap - a > bp - b) return +1; + r = strcmp(a, b); + *ap = ac, *bp = bc; + a = *a ? (ap + 1) : a; + b = *b ? (bp + 1) : b; + if (r) return r; + + /* Compare letter (non-digit) part. */ + ap = a + strcspn(a, "0123456789"); + bp = b + strcspn(b, "0123456789"); + ac = *ap, bc = *bp; + *ap = '\0', *bp = '\0'; + r = strcmp(a, b); + *ap = ac, *bp = bc; + a = *a ? (ap + 1) : a; + b = *b ? (bp + 1) : b; + if (r) return r; + } + + return 0; +} + + +/** + * Compare two version numbers. + * + * @param a One of the version numbers. + * @param b The other version number. + * @return <0: `a` < `b`. + * =0: `a` = `b`. + * >0: `a` > `b`. + */ +static int version_cmp(char *a, char *b) +{ +#define COMPARE \ + if (ap && bp) { \ + ac = *ap, bc = *bp; \ + *ap = *bp = '\0'; \ + r = version_subcmp(a, b); \ + *ap = ac, *bp = bc; \ + a = ap + 1, b = bp + 1; \ + } else if (ap) { \ + ac = *ap, *ap = '\0'; \ + r = version_subcmp(a, nil); \ + *ap = ac, a = ap + 1; \ + } else if (bp) { \ + bc = *bp, *bp = '\0'; \ + r = version_subcmp(nil, b); \ + *bp = bc, b = bp + 1; \ + } \ + if (r) return r + + char *ap; + char *bp; + char ac, bc; + int r = 0; + static char nil[1] = { '\0' }; + + /* Compare epoch. */ + ap = strchr(a, ':'); + bp = strchr(b, ':'); + COMPARE; + + /* Compare non-epoch */ + for (;;) { + ap = strchr(a, '.'); + bp = strchr(b, '.'); + if (!ap && !ap) + return 0; + COMPARE; + } + +#undef COMPARE +} + + +/** * @return 0: Program was successful. * 1: An error occurred. * 2: A library was not found. @@ -218,5 +322,7 @@ usage: fprintf(stderr, "%s: Invalid arguments, see `man 1 librarian'.\n", argv0); CLEANUP; return 3; + +#undef CLEANUP } |