| /* Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "jsvc.h" |
| |
| /* Replace all occurrences of a string in another */ |
| int replace(char *new, int len, char *old, char *mch, char *rpl) |
| { |
| char *tmp; |
| int count; |
| int shift; |
| int nlen; |
| int olen; |
| int mlen; |
| int rlen; |
| int x; |
| |
| /* The new buffer is NULL, fail */ |
| if (new == NULL) |
| return -1; |
| /* The length of the buffer is less than zero, fail */ |
| if (len < 0) |
| return -2; |
| /* The old buffer is NULL, fail */ |
| if (old == NULL) |
| return -3; |
| |
| /* The string to be matched is NULL or empty, simply copy */ |
| if ((mch == NULL) || (strlen(mch) == 0)) { |
| olen = strlen(old); |
| if (len <= olen) |
| return (olen + 1); |
| strcpy(new, old); |
| return 0; |
| } |
| |
| /* The string to be replaced is NULL, assume it's an empty string */ |
| if (rpl == NULL) |
| rpl = ""; |
| |
| /* Evaluate some lengths */ |
| olen = strlen(old); |
| mlen = strlen(mch); |
| rlen = strlen(rpl); |
| |
| /* Calculate how many times the mch string appears in old */ |
| tmp = old; |
| count = 0; |
| while ((tmp = strstr(tmp, mch)) != NULL) { |
| count++; |
| tmp += mlen; |
| } |
| |
| /* We have no matches, simply copy */ |
| if (count == 0) { |
| olen = strlen(old); |
| if (len <= olen) |
| return (olen + 1); |
| strcpy(new, old); |
| return 0; |
| } |
| |
| /* Calculate how big the buffer must be to hold the translation |
| * and of how many bytes we need to shift the data |
| */ |
| shift = rlen - mlen; |
| nlen = olen + (shift * count); |
| /* printf("Count=%d Shift= %d OLen=%d NLen=%d\n",count,shift,olen,nlen); */ |
| |
| /* Check if we have enough size in the buffer */ |
| if (nlen >= len) |
| return (nlen + 1); |
| |
| /* Copy over the old buffer in the new one (save memory) */ |
| strcpy(new, old); |
| |
| /* Start replacing */ |
| tmp = new; |
| while ((tmp = strstr(tmp, mch)) != NULL) { |
| /* If shift is > 0 we need to move data from right to left */ |
| if (shift > 0) { |
| for (x = (strlen(tmp) + shift); x > shift; x--) { |
| /* |
| printf("src %c(%d) dst %c(%d)\n", |
| tmp[x-shift],tmp[x-shift],tmp[x],tmp[x]); |
| */ |
| tmp[x] = tmp[x - shift]; |
| } |
| /* If shift is < 0 we need to move data from left to right */ |
| } |
| else if (shift < 0) { |
| for (x = mlen; x < strlen(tmp) - shift; x++) { |
| /* |
| printf("src %c(%d) dst %c(%d)\n", |
| tmp[x],tmp[x],tmp[x+shift],tmp[x+shift]); |
| */ |
| tmp[x + shift] = tmp[x]; |
| } |
| } |
| /* If shift is = 0 we don't have to shift data */ |
| strncpy(tmp, rpl, rlen); |
| tmp += rlen; |
| /* printf("\"%s\"\n",tmp); */ |
| } |
| return 0; |
| } |