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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 | * | |
4acfd1b7 PH |
47 | * Returns the length of the substituted string (not including the final \0). |
48 | * Like with snprintf, if the result is >= reslen, then it overflowed. | |
49ba83fb JL |
49 | */ |
50 | ||
80583c0e | 51 | unsigned long interpolate(char *result, unsigned long reslen, |
4dafd7d2 AR |
52 | const char *orig, |
53 | const struct interp *interps, int ninterps) | |
49ba83fb | 54 | { |
4dafd7d2 | 55 | const char *src = orig; |
49ba83fb | 56 | char *dest = result; |
80583c0e | 57 | unsigned long newlen = 0; |
3a55602e | 58 | const char *name, *value; |
80583c0e | 59 | unsigned long namelen, valuelen; |
49ba83fb JL |
60 | int i; |
61 | char c; | |
62 | ||
80583c0e | 63 | while ((c = *src)) { |
49ba83fb JL |
64 | if (c == '%') { |
65 | /* Try to match an interpolation string. */ | |
66 | for (i = 0; i < ninterps; i++) { | |
67 | name = interps[i].name; | |
68 | namelen = strlen(name); | |
80583c0e | 69 | if (strncmp(src, name, namelen) == 0) |
49ba83fb | 70 | break; |
49ba83fb JL |
71 | } |
72 | ||
73 | /* Check for valid interpolation. */ | |
74 | if (i < ninterps) { | |
75 | value = interps[i].value; | |
55246aac MV |
76 | if (!value) { |
77 | src += namelen; | |
78 | continue; | |
79 | } | |
49ba83fb | 80 | |
55246aac | 81 | valuelen = strlen(value); |
4acfd1b7 | 82 | if (newlen + valuelen < reslen) { |
49ba83fb | 83 | /* Substitute. */ |
4acfd1b7 | 84 | memcpy(dest, value, valuelen); |
49ba83fb | 85 | dest += valuelen; |
49ba83fb | 86 | } |
80583c0e JH |
87 | newlen += valuelen; |
88 | src += namelen; | |
89 | continue; | |
49ba83fb | 90 | } |
49ba83fb | 91 | } |
80583c0e JH |
92 | /* Straight copy one non-interpolation character. */ |
93 | if (newlen + 1 < reslen) | |
94 | *dest++ = *src; | |
95 | src++; | |
96 | newlen++; | |
49ba83fb JL |
97 | } |
98 | ||
4acfd1b7 PH |
99 | /* XXX: the previous loop always keep room for the ending NUL, |
100 | we just need to check if there was room for a NUL in the first place */ | |
101 | if (reslen > 0) | |
102 | *dest = '\0'; | |
103 | return newlen; | |
49ba83fb | 104 | } |