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/* * Copyright 2006 Jon Loeliger */ #include <string.h> #include "git-compat-util.h" #include "interpolate.h" void interp_set_entry(struct interp *table, int slot, const char *value) { char *oldval = table[slot].value; char *newval = NULL; if (oldval) free(oldval); if (value) newval = xstrdup(value); table[slot].value = newval; } void interp_clear_table(struct interp *table, int ninterps) { int i; for (i = 0; i < ninterps; i++) { interp_set_entry(table, i, NULL); } } /* * Convert a NUL-terminated string in buffer orig * into the supplied buffer, result, whose length is reslen, * performing substitutions on %-named sub-strings from * the table, interps, with ninterps entries. * * Example interps: * { * { "%H", "example.org"}, * { "%port", "123"}, * { "%%", "%"}, * } * * Returns 1 on a successful substitution pass that fits in result, * Returns 0 on a failed or overflowing substitution pass. */ int interpolate(char *result, int reslen, const char *orig, const struct interp *interps, int ninterps) { const char *src = orig; char *dest = result; int newlen = 0; char *name, *value; int namelen, valuelen; int i; char c; memset(result, 0, reslen); while ((c = *src) && newlen < reslen - 1) { if (c == '%') { /* Try to match an interpolation string. */ for (i = 0; i < ninterps; i++) { name = interps[i].name; namelen = strlen(name); if (strncmp(src, name, namelen) == 0) { break; } } /* Check for valid interpolation. */ if (i < ninterps) { value = interps[i].value; valuelen = strlen(value); if (newlen + valuelen < reslen - 1) { /* Substitute. */ strncpy(dest, value, valuelen); newlen += valuelen; dest += valuelen; src += namelen; } else { /* Something's not fitting. */ return 0; } } else { /* Skip bogus interpolation. */ *dest++ = *src++; newlen++; } } else { /* Straight copy one non-interpolation character. */ *dest++ = *src++; newlen++; } } return newlen < reslen - 1; }
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