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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 | * | |
80583c0e JH |
47 | * Returns 0 on a successful substitution pass that fits in result, |
48 | * Returns a number of bytes needed to hold the full substituted | |
49 | * string otherwise. | |
49ba83fb JL |
50 | */ |
51 | ||
80583c0e | 52 | unsigned long interpolate(char *result, unsigned long reslen, |
4dafd7d2 AR |
53 | const char *orig, |
54 | const struct interp *interps, int ninterps) | |
49ba83fb | 55 | { |
4dafd7d2 | 56 | const char *src = orig; |
49ba83fb | 57 | char *dest = result; |
80583c0e | 58 | unsigned long newlen = 0; |
3a55602e | 59 | const char *name, *value; |
80583c0e | 60 | unsigned long namelen, valuelen; |
49ba83fb JL |
61 | int i; |
62 | char c; | |
63 | ||
64 | memset(result, 0, reslen); | |
65 | ||
80583c0e | 66 | while ((c = *src)) { |
49ba83fb JL |
67 | if (c == '%') { |
68 | /* Try to match an interpolation string. */ | |
69 | for (i = 0; i < ninterps; i++) { | |
70 | name = interps[i].name; | |
71 | namelen = strlen(name); | |
80583c0e | 72 | if (strncmp(src, name, namelen) == 0) |
49ba83fb | 73 | break; |
49ba83fb JL |
74 | } |
75 | ||
76 | /* Check for valid interpolation. */ | |
77 | if (i < ninterps) { | |
78 | value = interps[i].value; | |
79 | valuelen = strlen(value); | |
80 | ||
80583c0e | 81 | if (newlen + valuelen + 1 < reslen) { |
49ba83fb JL |
82 | /* Substitute. */ |
83 | strncpy(dest, value, valuelen); | |
49ba83fb | 84 | dest += valuelen; |
49ba83fb | 85 | } |
80583c0e JH |
86 | newlen += valuelen; |
87 | src += namelen; | |
88 | continue; | |
49ba83fb | 89 | } |
49ba83fb | 90 | } |
80583c0e JH |
91 | /* Straight copy one non-interpolation character. */ |
92 | if (newlen + 1 < reslen) | |
93 | *dest++ = *src; | |
94 | src++; | |
95 | newlen++; | |
49ba83fb JL |
96 | } |
97 | ||
80583c0e JH |
98 | if (newlen + 1 < reslen) |
99 | return 0; | |
100 | else | |
101 | return newlen + 2; | |
49ba83fb | 102 | } |