104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
/*
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* Copyright 2006 Jon Loeliger
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*/
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#include "git-compat-util.h"
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#include "interpolate.h"
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void interp_set_entry(struct interp *table, int slot, const char *value)
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{
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char *oldval = table[slot].value;
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char *newval = NULL;
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free(oldval);
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if (value)
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newval = xstrdup(value);
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table[slot].value = newval;
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}
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void interp_clear_table(struct interp *table, int ninterps)
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{
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int i;
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for (i = 0; i < ninterps; i++) {
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interp_set_entry(table, i, NULL);
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}
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}
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/*
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* Convert a NUL-terminated string in buffer orig
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* into the supplied buffer, result, whose length is reslen,
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* performing substitutions on %-named sub-strings from
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* the table, interps, with ninterps entries.
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*
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* Example interps:
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* {
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* { "%H", "example.org"},
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* { "%port", "123"},
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* { "%%", "%"},
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* }
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*
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* Returns the length of the substituted string (not including the final \0).
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* Like with snprintf, if the result is >= reslen, then it overflowed.
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*/
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unsigned long interpolate(char *result, unsigned long reslen,
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const char *orig,
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const struct interp *interps, int ninterps)
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{
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const char *src = orig;
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char *dest = result;
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unsigned long newlen = 0;
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const char *name, *value;
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unsigned long namelen, valuelen;
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int i;
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char c;
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while ((c = *src)) {
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if (c == '%') {
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/* Try to match an interpolation string. */
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for (i = 0; i < ninterps; i++) {
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name = interps[i].name;
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namelen = strlen(name);
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if (strncmp(src, name, namelen) == 0)
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break;
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}
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/* Check for valid interpolation. */
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if (i < ninterps) {
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value = interps[i].value;
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if (!value) {
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src += namelen;
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continue;
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}
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valuelen = strlen(value);
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if (newlen + valuelen < reslen) {
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/* Substitute. */
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memcpy(dest, value, valuelen);
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dest += valuelen;
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}
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newlen += valuelen;
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src += namelen;
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continue;
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}
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}
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/* Straight copy one non-interpolation character. */
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if (newlen + 1 < reslen)
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*dest++ = *src;
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src++;
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newlen++;
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}
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/* XXX: the previous loop always keep room for the ending NUL,
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we just need to check if there was room for a NUL in the first place */
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if (reslen > 0)
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*dest = '\0';
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return newlen;
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}
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