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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 | 13 | |
8e0f7003 | 14 | free(oldval); |
eb30aed7 JL |
15 | |
16 | if (value) | |
17 | newval = xstrdup(value); | |
18 | ||
19 | table[slot].value = newval; | |
20 | } | |
21 | ||
22 | ||
23 | void interp_clear_table(struct interp *table, int ninterps) | |
24 | { | |
25 | int i; | |
26 | ||
27 | for (i = 0; i < ninterps; i++) { | |
28 | interp_set_entry(table, i, NULL); | |
29 | } | |
30 | } | |
31 | ||
32 | ||
49ba83fb JL |
33 | /* |
34 | * Convert a NUL-terminated string in buffer orig | |
35 | * into the supplied buffer, result, whose length is reslen, | |
36 | * performing substitutions on %-named sub-strings from | |
37 | * the table, interps, with ninterps entries. | |
38 | * | |
39 | * Example interps: | |
40 | * { | |
41 | * { "%H", "example.org"}, | |
42 | * { "%port", "123"}, | |
43 | * { "%%", "%"}, | |
44 | * } | |
45 | * | |
4acfd1b7 PH |
46 | * Returns the length of the substituted string (not including the final \0). |
47 | * Like with snprintf, if the result is >= reslen, then it overflowed. | |
49ba83fb JL |
48 | */ |
49 | ||
80583c0e | 50 | unsigned long interpolate(char *result, unsigned long reslen, |
4dafd7d2 AR |
51 | const char *orig, |
52 | const struct interp *interps, int ninterps) | |
49ba83fb | 53 | { |
4dafd7d2 | 54 | const char *src = orig; |
49ba83fb | 55 | char *dest = result; |
80583c0e | 56 | unsigned long newlen = 0; |
3a55602e | 57 | const char *name, *value; |
80583c0e | 58 | unsigned long namelen, valuelen; |
49ba83fb JL |
59 | int i; |
60 | char c; | |
61 | ||
80583c0e | 62 | while ((c = *src)) { |
49ba83fb JL |
63 | if (c == '%') { |
64 | /* Try to match an interpolation string. */ | |
65 | for (i = 0; i < ninterps; i++) { | |
66 | name = interps[i].name; | |
67 | namelen = strlen(name); | |
80583c0e | 68 | if (strncmp(src, name, namelen) == 0) |
49ba83fb | 69 | break; |
49ba83fb JL |
70 | } |
71 | ||
72 | /* Check for valid interpolation. */ | |
73 | if (i < ninterps) { | |
74 | value = interps[i].value; | |
55246aac MV |
75 | if (!value) { |
76 | src += namelen; | |
77 | continue; | |
78 | } | |
49ba83fb | 79 | |
55246aac | 80 | valuelen = strlen(value); |
4acfd1b7 | 81 | if (newlen + valuelen < reslen) { |
49ba83fb | 82 | /* Substitute. */ |
4acfd1b7 | 83 | memcpy(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 | ||
4acfd1b7 PH |
98 | /* XXX: the previous loop always keep room for the ending NUL, |
99 | we just need to check if there was room for a NUL in the first place */ | |
100 | if (reslen > 0) | |
101 | *dest = '\0'; | |
102 | return newlen; | |
49ba83fb | 103 | } |