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Commit | Line | Data |
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49ba83fb JL |
1 | /* |
2 | * Copyright 2006 Jon Loeliger | |
3 | */ | |
4 | ||
eb30aed7 | 5 | #include "git-compat-util.h" |
49ba83fb JL |
6 | #include "interpolate.h" |
7 | ||
8 | ||
a2838377 | 9 | void interp_set_entry(struct interp *table, int slot, const char *value) |
eb30aed7 JL |
10 | { |
11 | char *oldval = table[slot].value; | |
a2838377 | 12 | char *newval = NULL; |
eb30aed7 JL |
13 | |
14 | if (oldval) | |
15 | free(oldval); | |
16 | ||
17 | if (value) | |
18 | newval = xstrdup(value); | |
19 | ||
20 | table[slot].value = newval; | |
21 | } | |
22 | ||
23 | ||
24 | void interp_clear_table(struct interp *table, int ninterps) | |
25 | { | |
26 | int i; | |
27 | ||
28 | for (i = 0; i < ninterps; i++) { | |
29 | interp_set_entry(table, i, NULL); | |
30 | } | |
31 | } | |
32 | ||
33 | ||
49ba83fb JL |
34 | /* |
35 | * Convert a NUL-terminated string in buffer orig | |
36 | * into the supplied buffer, result, whose length is reslen, | |
37 | * performing substitutions on %-named sub-strings from | |
38 | * the table, interps, with ninterps entries. | |
39 | * | |
40 | * Example interps: | |
41 | * { | |
42 | * { "%H", "example.org"}, | |
43 | * { "%port", "123"}, | |
44 | * { "%%", "%"}, | |
45 | * } | |
46 | * | |
47 | * Returns 1 on a successful substitution pass that fits in result, | |
48 | * Returns 0 on a failed or overflowing substitution pass. | |
49 | */ | |
50 | ||
51 | int interpolate(char *result, int reslen, | |
4dafd7d2 AR |
52 | const char *orig, |
53 | const struct interp *interps, int ninterps) | |
49ba83fb | 54 | { |
4dafd7d2 | 55 | const char *src = orig; |
49ba83fb JL |
56 | char *dest = result; |
57 | int newlen = 0; | |
58 | char *name, *value; | |
59 | int namelen, valuelen; | |
60 | int i; | |
61 | char c; | |
62 | ||
63 | memset(result, 0, reslen); | |
64 | ||
65 | while ((c = *src) && newlen < reslen - 1) { | |
66 | if (c == '%') { | |
67 | /* Try to match an interpolation string. */ | |
68 | for (i = 0; i < ninterps; i++) { | |
69 | name = interps[i].name; | |
70 | namelen = strlen(name); | |
71 | if (strncmp(src, name, namelen) == 0) { | |
72 | break; | |
73 | } | |
74 | } | |
75 | ||
76 | /* Check for valid interpolation. */ | |
77 | if (i < ninterps) { | |
78 | value = interps[i].value; | |
79 | valuelen = strlen(value); | |
80 | ||
81 | if (newlen + valuelen < reslen - 1) { | |
82 | /* Substitute. */ | |
83 | strncpy(dest, value, valuelen); | |
84 | newlen += valuelen; | |
85 | dest += valuelen; | |
86 | src += namelen; | |
87 | } else { | |
88 | /* Something's not fitting. */ | |
89 | return 0; | |
90 | } | |
91 | ||
92 | } else { | |
93 | /* Skip bogus interpolation. */ | |
94 | *dest++ = *src++; | |
95 | newlen++; | |
96 | } | |
97 | ||
98 | } else { | |
99 | /* Straight copy one non-interpolation character. */ | |
100 | *dest++ = *src++; | |
101 | newlen++; | |
102 | } | |
103 | } | |
104 | ||
105 | return newlen < reslen - 1; | |
106 | } |