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Commit | Line | Data |
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49ba83fb JL |
1 | /* |
2 | * Copyright 2006 Jon Loeliger | |
3 | */ | |
4 | ||
5 | #include <string.h> | |
6 | ||
eb30aed7 | 7 | #include "git-compat-util.h" |
49ba83fb JL |
8 | #include "interpolate.h" |
9 | ||
10 | ||
a2838377 | 11 | void interp_set_entry(struct interp *table, int slot, const char *value) |
eb30aed7 JL |
12 | { |
13 | char *oldval = table[slot].value; | |
a2838377 | 14 | char *newval = NULL; |
eb30aed7 JL |
15 | |
16 | if (oldval) | |
17 | free(oldval); | |
18 | ||
19 | if (value) | |
20 | newval = xstrdup(value); | |
21 | ||
22 | table[slot].value = newval; | |
23 | } | |
24 | ||
25 | ||
26 | void interp_clear_table(struct interp *table, int ninterps) | |
27 | { | |
28 | int i; | |
29 | ||
30 | for (i = 0; i < ninterps; i++) { | |
31 | interp_set_entry(table, i, NULL); | |
32 | } | |
33 | } | |
34 | ||
35 | ||
49ba83fb JL |
36 | /* |
37 | * Convert a NUL-terminated string in buffer orig | |
38 | * into the supplied buffer, result, whose length is reslen, | |
39 | * performing substitutions on %-named sub-strings from | |
40 | * the table, interps, with ninterps entries. | |
41 | * | |
42 | * Example interps: | |
43 | * { | |
44 | * { "%H", "example.org"}, | |
45 | * { "%port", "123"}, | |
46 | * { "%%", "%"}, | |
47 | * } | |
48 | * | |
49 | * Returns 1 on a successful substitution pass that fits in result, | |
50 | * Returns 0 on a failed or overflowing substitution pass. | |
51 | */ | |
52 | ||
53 | int interpolate(char *result, int reslen, | |
4dafd7d2 AR |
54 | const char *orig, |
55 | const struct interp *interps, int ninterps) | |
49ba83fb | 56 | { |
4dafd7d2 | 57 | const char *src = orig; |
49ba83fb JL |
58 | char *dest = result; |
59 | int newlen = 0; | |
60 | char *name, *value; | |
61 | int namelen, valuelen; | |
62 | int i; | |
63 | char c; | |
64 | ||
65 | memset(result, 0, reslen); | |
66 | ||
67 | while ((c = *src) && newlen < reslen - 1) { | |
68 | if (c == '%') { | |
69 | /* Try to match an interpolation string. */ | |
70 | for (i = 0; i < ninterps; i++) { | |
71 | name = interps[i].name; | |
72 | namelen = strlen(name); | |
73 | if (strncmp(src, name, namelen) == 0) { | |
74 | break; | |
75 | } | |
76 | } | |
77 | ||
78 | /* Check for valid interpolation. */ | |
79 | if (i < ninterps) { | |
80 | value = interps[i].value; | |
81 | valuelen = strlen(value); | |
82 | ||
83 | if (newlen + valuelen < reslen - 1) { | |
84 | /* Substitute. */ | |
85 | strncpy(dest, value, valuelen); | |
86 | newlen += valuelen; | |
87 | dest += valuelen; | |
88 | src += namelen; | |
89 | } else { | |
90 | /* Something's not fitting. */ | |
91 | return 0; | |
92 | } | |
93 | ||
94 | } else { | |
95 | /* Skip bogus interpolation. */ | |
96 | *dest++ = *src++; | |
97 | newlen++; | |
98 | } | |
99 | ||
100 | } else { | |
101 | /* Straight copy one non-interpolation character. */ | |
102 | *dest++ = *src++; | |
103 | newlen++; | |
104 | } | |
105 | } | |
106 | ||
107 | return newlen < reslen - 1; | |
108 | } |